CN108024258B

CN108024258B - Small signal diffusion networking method for wireless network equipment

Info

Publication number: CN108024258B
Application number: CN201711260480.5A
Authority: CN
Inventors: 丁昊; 齐芸芸
Original assignee: Wuhan Weizhi Chuangda Technology Co ltd
Current assignee: Wuhan Weizhi Chuangda Technology Co ltd
Priority date: 2017-12-04
Filing date: 2017-12-04
Publication date: 2020-05-29
Anticipated expiration: 2037-12-04
Also published as: CN108024258A

Abstract

The invention discloses a small signal diffusion networking method of wireless network equipment, wherein an equipment node in the method adopts a self-detection mode to calculate and determine the transmitting power of a wireless signal when carrying out wireless communication networking, and the self-detection overall steps are as follows: the method comprises the steps of variable power signal detection, detection data exchange, detection data grouping, detection data sequencing, emission power confirmation, networking information forwarding table confirmation and cyclic diffusion networking. The invention takes the gateway equipment of the wireless network as an initial node, adopts the wireless small signal transmitting power to carry out diffusion networking, can transmit the wireless communication distance detection of the variable power detection frame from large to small, from far to near, from small to large and from near to far, links all the equipment in the wireless space into the wireless network taking the gateway equipment as the initial point, selects the minimum wireless transmitting power on the premise of ensuring that the wireless network equipment can reliably carry out networking communication and information forwarding, and ensures that the wireless signal coverage of the equipment is minimized.

Description

Small signal diffusion networking method for wireless network equipment

Technical Field

The invention relates to a method, in particular to a small signal diffusion networking method for wireless network equipment, and belongs to the technical field of Internet of things.

Background

In the field of the internet of things, various wireless network communication technologies are adopted for communication and information interaction between objects and people. In order to realize communication among more wireless network devices, people usually use high-power wireless transmitting devices to perform wireless signal coverage in a large-scale space, so that each wireless network device in the large-scale space can communicate with a wireless management center device. However, from the aspect of radio frequency resource allocation, the wireless coverage of a large-scale space causes a great deal of frequency space domain resource waste, and therefore, when two wireless devices perform wireless communication at a certain frequency point in the large-scale space, other wireless devices cannot perform wireless communication at the frequency point, and another frequency point needs to be selected for communication, thereby causing low communication efficiency of multipoint devices in the large-scale space and high utilization efficiency of frequency resources.

Therefore, in the actual use process, the high-power wireless transmitting equipment is regulated by the national radio administration committee, and the situation that the high-power wireless transmitting equipment causes radio interference on important wireless communication equipment of other countries so as to influence the life and production safety of people is avoided; meanwhile, the wireless signal radiation emitted by the high-power wireless transmitting equipment has great harm to human bodies, and the health of people can be threatened after a long time. At present, manufacturers adopt a manual configuration mode to perform networking of wireless network equipment, and then manually configure the transmission power of the wireless network equipment to realize small-signal coverage of networking of the wireless network equipment, but in the field of numerous internet of things, the networking mode and the transmission power of each wireless network equipment need to be configured, the networking workload is very large, once the conditions of movement, failure, newly added equipment and the like of the network equipment occur, each equipment needs to be configured once, and the adaptability of the wireless network is very low.

Disclosure of Invention

In order to solve the defects of the technology, the invention provides a small signal diffusion networking method of wireless network equipment.

In order to solve the technical problems, the invention adopts the technical scheme that: a small signal diffusion networking method of wireless network equipment comprises the following steps:

step S1, all wireless network devices participating in wireless networking communication are named as device nodes; the method comprises the steps of naming a device node needing wireless transmission power calculation as an active device; the method comprises the steps of naming a device node which is possible to wirelessly network with the active device as a passive device;

step S2, the equipment nodes are enabled to carry out wireless communication networking by adopting a self-detection mode; in the wireless communication networking, an active device which firstly initiates wireless power calculation self-detection is named as a gateway active device; starting from the gateway active device, calculating the transmission power of the device from detection and small signal diffusion wireless networking towards other device nodes; after the gateway active device completes self-detection, the device closest to the gateway active device is taken as the active device to perform self-detection, and the process is circulated until all the devices of the whole wireless communication network are diffused;

the overall steps of the self-detection are as follows:

step S21, variable power signal detection: transmitting power detection frames by adopting transmission power from large to small and from small to large, receiving the power detection frames by passive equipment, recording received signal strength RSSI values and recording signal strength items;

step S22, probe data exchange: transmitting the signal intensity items recorded by the passive equipment to the active equipment through wireless signals and storing the signal intensity items;

step S23, probe data grouping: after storing the signal strength items obtained by exchange, the active device groups the signal strength items according to the transmitting power in the signal strength items and divides the same transmitting power into a group; the step is used for grouping the acquired signal strength items of the plurality of passive devices according to the same transmitting power, and the wireless coverage of the plurality of passive devices under the condition of one transmitting power is completed;

step S24, probe data sorting: sorting the grouped data according to the average value and the minimum value of the received signal strength in the signal strength items from large to small; this step completes the distance identification of the passive device;

step S25, transmission power confirmation: determining how many passive devices are covered by the wireless signal of the active device at least to finally confirm the transmitting power of the wireless network device according to the actual wireless networking requirement of the wireless network device; the step completes the confirmation of the wireless small signal transmitting power;

step S26, the network information forwarding table confirms: arranging an information forwarding table of the passive equipment for wireless network networking according to the recognized distance sequence according to the sequencing result of the detection data; the step is used for selecting the transmission of the long-distance equipment or the transmission of the short-distance equipment according to the priority of the transmission instruction when the wireless network equipment forwards the data information;

step S27, cyclic diffusion networking: repeating the steps S21-S26, and carrying out the transmission power confirmation and small signal diffusion networking of the equipment in a circulating repeated diffusion mode; up to all devices in the wireless network.

In the variable power signal detection process of step S21, the variable power sends a power detection frame according to the transmission power from large to small, i.e., the variable power performs variable power detection by reducing the power by 3dbm every time the transmission power is reduced, i.e., by halving the power; the variable power mode can effectively cover all variable power and as many passive devices as possible, and the signal detection precision is highest; the method is used for first networking time-varying function detection.

In the variable power signal detection process of step S21, the variable power sends a power detection frame according to the transmission power from small to large, i.e., the variable power performs variable power detection according to each transmission power increase of 3dbm, i.e., the power increase is doubled; the variable power mode can reach the preset low-power signal value at the fastest speed, and the signal detection speed is the fastest; the method is used for carrying out repeated variable power detection under the condition that the small signal transmission power is determined after networking.

In the variable power signal detection process of STEP S21, the number N of detection frames sent by the active device and the value of PWR _ STEP for power reduction/power increase during each variable power detection can be determined according to the detection time and detection accuracy of the device, and in the case where high detection accuracy and fixed wireless device are required, the value of N is larger and the value of PWR _ STEP is smaller; in the occasion of needing shorter time to finish detection and move the wireless equipment, the value of N is smaller, and the value of PWR _ STEP is larger.

In order to reduce the interference of wireless signals, all devices in a wireless airspace are allowed to continue to start the suspended wireless communication task as long as the current wireless communication task is completely suspended after a frame of power detection frame is received, the silent receiving mode is entered, the silent time is 3 seconds, and after 3 seconds, any power detection frame is not received; the mechanism can preferentially ensure the wireless signal transmission of the power detection frame, reduce the interference of wireless signal small-range coverage self-detection and improve the self-detection precision.

The signal strength entries in step S21 are divided into storage type signal strength entries and transmission type signal strength entries; the storage type signal strength item is used for recording the signal strength of a wireless signal sent to the passive device by the active device, and comprises five parts, namely transmitting power, an average value of received signal strength, a minimum value of received signal strength, the number of received lost frames and the receiving device; the transmitting power is the transmitting power of a wireless signal when the active device sends information, the average value of the received signals is the average value of the signal strength of the wireless signal of the active device received by the passive device, the minimum value of the received signal strength is the minimum value of the signal strength of the wireless signal of the active device received by the passive device, the receiving frame loss quantity R is the data of how many active devices are lost by the passive device, and the receiving device is the ID serial number of the passive device; the transmission type signal intensity item is designed for improving the wireless transmission efficiency, omits a receiving device compared with a standard signal intensity item, and is mainly used for rapidly transmitting signal intensity data between an active device and a passive device so as to improve the wireless transmission efficiency.

Communication frames of the signal intensity items in data exchange and transmission comprise a power detection frame, a detection data request frame and a detection data transmission frame; the power detection frame is used for detecting the wireless transmission power of the active equipment and comprises a frame header, a frame type, the total number of sent frames, a sent frame sequence number, the transmission power of the detection frame, the ID of the active equipment of the detection frame and the CRC check; the detection data request frame is used for the active device to request a signal strength item from the passive device, and comprises a frame header, a frame type, a request frame sequence number, a request device ID, an active device ID, a passive device ID and CRC (cyclic redundancy check); the detection data transmission frame is used for transmitting signal intensity items from the passive equipment to the active equipment, and comprises a frame head, a frame type, a total signal intensity, the number of the current frame signal intensity items, a signal intensity item serial number, items 1-n, a request frame active equipment ID, a response frame passive equipment ID and CRC (cyclic redundancy check); in order to save frame space and improve wireless transmission efficiency, the signal strength entries in the probe data transmission frame are transmitted by using transmission type signal strength entries.

The active equipment and the passive equipment are named in the single signal detection process, and only one active equipment is provided and any number of passive equipment is provided in the wireless signal transmission power self-detection process of each equipment node; in the whole wireless network, self-detection is carried out from gateway equipment, and then, self-detection is carried out by taking passive equipment closest to the gateway active equipment as active equipment.

The invention takes the gateway equipment of the wireless network as an initial node, adopts the wireless small signal transmitting power to carry out diffusion networking, can transmit the wireless communication distance detection of the variable power detection frame from large to small, from far to near, from small to large and from near to far, links all the equipment in the wireless space into the wireless network taking the gateway equipment as the initial point, selects the minimum wireless transmitting power on the premise of ensuring that the wireless network equipment can reliably carry out networking communication and information forwarding, and ensures that the coverage range of the wireless signal is minimized. Therefore, the invention can meet the requirement of automatic networking of small signal transmitting power, reduce the interference and influence of non-network equipment on other equipment, reduce the power consumption of wireless network equipment, prolong the service life of battery equipment, and finally utilize wireless frequency domain and space domain resources to the maximum extent, thereby greatly improving the efficiency of wireless network communication. In addition, the invention solves the problem of automatic networking of the low-power signals of the wireless network equipment, does not need the wireless network equipment to configure the maximum power and the networking information forwarding table, achieves the purpose of automatic networking and does not need manual intervention.

Drawings

FIG. 1 is a flowchart of the overall steps of self-detection.

Fig. 2 is a direction-showing diagram of the calculation of the device transmit power from probing and small signal spreading.

Fig. 3 is a process diagram of variable power signal detection.

Fig. 4 is a process diagram showing probe data sorting.

FIG. 5 is a schematic diagram of the connection relationship of the apparatus used in the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 shows a small signal diffusion networking method for wireless network devices, where a wireless network device in the method refers to any multiple wireless network devices A, B, C, D, E, F, G … … in a larger airspace, and the wireless network devices interact with each other through wireless signals at the same wireless communication frequency and with appropriate wireless transmission power, so as to complete wireless networking communication between devices and implement information interaction and transmission between devices; in order to facilitate the description of subsequent documents, all wireless network devices participating in wireless networking communication are named as device nodes, the wireless communication frequency adopted by each device node is named as a wireless frequency point, and the wireless transmission power adopted by each device node is named as wireless power. The method comprises the steps of naming a self-detection device node which needs to be subjected to wireless transmission power calculation as an 'active detection device', simply called an 'active device', and naming a device node which is possibly subjected to wireless networking with the active detection device as a 'passive response device', simply called a 'passive device'; in the wireless communication networking of the invention, in the process of carrying out wireless signal transmission power self-detection on each equipment node, there is only one active equipment, and there can be any more passive equipments. In the whole wireless network, self-detection is carried out from gateway equipment, and then, self-detection is carried out by taking passive equipment closest to the gateway active equipment as active equipment.

Furthermore, it should be noted that: the active device and the passive device are named in the single signal detection process, but in the whole wireless network, all the devices are devices of the same level, the same self-detection mode is adopted, the detection mechanism and the flow of all the devices are the same, and the devices do not have the difference between a master device and a slave device, and completely belong to a balanced wireless communication network.

In the wireless communication networking, an active device A which firstly initiates wireless power calculation self-detection is named as a gateway active device; starting from the gateway active device a, the self-detection of device transmission power and small signal diffusion wireless networking are calculated towards direction B, C, D, E, F, G … …. As shown in fig. 2.

The self-detection mode in the method is that the transmitting power of the active device A is adjusted from large to small to measure and calculate how many passive devices can receive wireless signals of the active device A under each transmitting power; the signal intensity of a wireless signal sent by the active device A to the passive device is detected, the space distance from the passive device to the active device A is judged, the distance sorting of the passive device is carried out according to the space distance between the devices, then the active device A selects a plurality of key necessary passive devices B, C, D sorted according to the close range to carry out wireless communication networking, and therefore the active device A adopts the minimum wireless transmitting power to carry out wireless networking communication on the premise that the necessary close range passive devices meeting the keys can carry out safe and reliable communication; then, the passive device B with the closest distance is taken as an active device, the transmitting power of the active device is adjusted from large to small in the direction C, D, E, F, G … … to carry out the calculation and self-detection of the device transmitting power, the device B selects a plurality of key necessary passive devices C, D, E which are sequenced according to the close distance to carry out wireless communication networking, and the small signal diffusion networking of the wireless network device is circularly realized. According to the steps, the operation process of the self-detection mode is as follows:

The signal strength entries may be divided into storage type signal strength entries and transmission type signal strength entries. The storage type signal strength item is used for recording the signal strength of a wireless signal sent to the passive device by the active device, and comprises five parts, namely transmission power S _ PWR, a received signal strength average value RSSI _ AVG, a received signal strength minimum value RSSI _ MIN, a received frame loss number RSSI _ LOSE and a receiving device ID RECV _ ID; the transmission power S _ PWR is the transmission power of wireless signals when the active equipment sends information, the received signal average value RSSI _ AVG is the signal strength average value of the wireless signals of the active equipment received by the passive equipment, the received signal strength minimum value RSSI _ MIN is the signal strength minimum value of the wireless signals of the active equipment received by the passive equipment, the received frame loss number RSSI _ LOSE is the data of how many active equipment are lost by the passive equipment, and the receiving equipment RECV _ ID is the ID serial number of the passive equipment. The structural composition is shown in table 1.

TABLE 1

The transmission type signal strength item is designed for improving the wireless transmission efficiency, omits a receiving device RECV _ ID compared with a standard signal strength item, and is mainly used for quickly transmitting signal strength data between an active device and a passive device so as to improve the wireless transmission efficiency. The structural composition is shown in table 2.

TABLE 2

In addition, the method designs three communication frames for facilitating data exchange and transmission of wireless signal strength items of the active device and the passive device: 1. the power detection frame is used for detecting the wireless transmission power of the active equipment and comprises a frame head, a frame type, the total number of sent frames, a sent frame sequence number, the transmission power of the detection frame, the ID of the active equipment of the detection frame and the CRC check; 2. the detection data request frame is used for requesting a signal strength item from the passive equipment by the active equipment and comprises a frame head, a frame type, a request frame sequence number, a request equipment ID, an active equipment ID, a passive equipment ID and CRC (cyclic redundancy check); 3. the detection data transmission frame is used for transmitting signal intensity items from the passive equipment to the active equipment, and comprises a frame head, a frame type, a total signal intensity, the number of the current frame signal intensity items, a signal intensity item serial number, items 1-n, a request frame active equipment ID, a response frame passive equipment ID and CRC (cyclic redundancy check); in order to save frame space and improve wireless transmission efficiency, the signal strength entries in the probe data transmission frame are transmitted by using transmission type signal strength entries. The structures of the power probe frame, the probe request frame, and the probe transmission frame are shown in table 3, table 4, and table 5, respectively.

TABLE 3

TABLE 4

TABLE 5

The variable power signal detection mode in step S21 (see fig. 3): 1. the active device A continuously and quickly sends N power detection frames to all passive devices in the airspace at the same time by using the maximum wireless transmission power PWR _ MAX of a wireless signal transmitter of a device node, wherein N is less than or equal to 255, and the default value N is 32; the active device records wireless transmitting power PWR _ SEND as PWR _ MAX, the transmitting power field in the power detecting frame fills the transmitting power of the current wireless transmitter, and the transmitting frame number field fills the currently transmitted power detecting frame; 2. the passive device B in the airspace receives M power detection frames of the active device A, records the RSSI value of each frame, extracts the ID serial number of the active device from the power detection frames and records the ID serial number S _ ID, extracts the wireless transmission power of the active device A and records the wireless transmission power S _ PWR, and extracts the total number N of the transmission frames; 3. calculating a frame loss rate by using a formula (M-N)/Nx100%, wherein when the frame loss rate of a power detection frame received by a passive device B is less than or equal to 10%, the passive device B can basically and completely receive a wireless signal of an active device A, the device node B eliminates the largest two RSSI numbers, calculates the average value of the remaining M-2 RSSI numbers and records the average value as a received signal strength average value RSSI _ AVG, selects the smallest RSSI number from the M-2 RSSI numbers and records the minimum value RSSI _ MIN as the received signal strength, and records the received frame loss amount RSSI _ LOSE as N-M as 0; when the frame loss rate of the power detection frame received by the passive device B is less than or equal to 10%, the passive device B can drop the wireless signal of the active device A, the passive device B directly calculates the tie value of each RSSI numerical value of M and records the tie value as the received signal strength average value RSSI _ AVG, meanwhile, the minimum RSSI numerical value is selected from the M RSSI numerical values and recorded as the received signal strength minimum value RSSI _ MIN, and the received frame loss quantity RSSI _ LOSE is recorded as N-M; 4. after the passive device B calculates the average value of the received signal strength, the active device S _ ID, the transmitting power S _ PWR, the average value RSSI _ AVG of the received signal strength, the minimum value RSSI _ MIN of the received signal strength and the received frame loss amount RSSI _ LOSE are recorded into a transmission type signal strength item of the active device A; 5. similarly, the passive device C, D, E, F, G … … will receive the power probe frame of the active device a similarly to the passive device B, and calculate and record a transmission-type signal strength entry of the active device a; 6. after the N power detection frames are sent, the active device delays 1 second to wait for the passive device to calculate and record a transmission type signal intensity item of the active device A, then the active device A reduces the wireless transmission power of the active device A according to a formula PWR _ SEND which is PWR _ SEND-PWR _ STEP, the PWR _ STEP is a power value of power reduction during each variable power detection, the default PWR _ STEP is 3dbm transmission power and is reduced by half, when the variable power is detected from small to large, the PWR _ STEP increases 3dbm transmission power and is doubled, and the STEPs 1-5 are repeated to SEND the N power detection frames to all the passive devices in the airspace; the passive device B, C, D, E, F, G … … will accept, calculate, and record a new entry for the tx signal strength of the active device a; 7. repeating the steps 1-6 until the wireless transmitting power of the active equipment node A is reduced to less than-6 bdm or increased to a preset transmitting power, and stopping sending the power detection frame to the airspace; until the power-variable signal detection is completely completed, each passive device B, C, D, E, F, G … … records transmission-type signal strength entries of a plurality of active devices a, and the passive devices closer to the active device a have more transmission-type signal strength entries, and the larger the signal strength value is, the smaller the frame loss amount is, the lower the frame loss rate is, the passive devices farther from the active device a have less transmission-type signal strength entries, or even none of them, and the smaller the signal strength value is, the larger the frame loss amount is, and the higher the frame loss rate is.

In order to reduce the interference of wireless signals, all devices in a wireless airspace are allowed to continue to start the suspended wireless communication task only after receiving a frame of power detection frame and completely suspending the current wireless communication task to enter a 3-second silent receiving mode, wherein the silent time is 3 seconds, and after 3 seconds, any power detection frame is not received; the mechanism can preferentially ensure the wireless signal transmission of the power detection frame, reduce the interference of wireless signal small-range coverage self-detection and improve the self-detection precision.

After the active device a in the method sends the power detection frame to all the passive devices B, C, D, E, F, G … … in the airspace and records the transmission-type signal strength entry on the passive devices, the step S22 of exchanging the detection data is immediately performed: 1. the active device A simultaneously sends a detection data request frame to all passive devices in the airspace by using the maximum wireless transmitting power PWR _ MAX of a wireless signal transmitter of the device node, and requires the passive device B to transmit the signal intensity item of the active device A recorded by the passive device B to the active node A; 2. after receiving the detection data request frame, the passive device B replies a detection data transmission frame, a transmission type signal intensity item, to the active device A with the maximum wireless transmission power PWR _ MAX of the transmitter; in order to improve the transmission efficiency and save the transmission space, a transmission type signal intensity entry format is adopted for transmission in the transmission process, and an ID of an active device A and an ID of a passive device B are added at the tail of a frame to represent a transmitter A and a receiver B of the signal intensity entry; 3. after all the signal intensity items recorded by the passive device B are transmitted to the active device A, the active device A adds the ID of the passive device B of a power detection frame receiver at the tail of the transmission type signal intensity item to form a storage type signal intensity item for storage; 4. similarly, the passive device C, D, E, F, G … … transmits the signal strength entry to the active device a similarly to the passive device B, and the active device a adds the ID of the power probe frame receiver to the tail of the signal strength entry to form a storage-type signal strength entry for storage; the active device a thus completes the collection and storage of all signal strength entries that can be collected through the probe data request frame and the probe data transmission frame.

After receiving the signal strength items transmitted by all passive devices in the air space, the active device a immediately performs step S23 to detect data packets, performs item grouping according to the transmission power S _ PWR in the signal strength items, and divides the items with the same transmission power S _ PWR into a group; according to the invention, as the wireless transmission power is reduced, the wireless coverage area is smaller, the passive devices capable of receiving the power detection frame are fewer, and the grouped signal strength items are fewer.

The specific process of sequencing the detection data in step S24 is as follows: 1. sorting the signal intensity items grouped by the same transmitting power S _ PWR from large to small according to the size of the signal intensity average value; when the average values of the signal intensity are the same in the sorting process, sorting from large to small according to the size of the minimum value of the signal intensity; if the difference between the minimum signal strengths of two adjacent entries is less than or equal to 3dbm, comparing the frame loss numbers of the two entries, arranging the entry with less frame loss number in the front, and arranging the entry with more frame loss number in the tail; 2. after the signal strength items of each S _ PWR group are sequenced, the sequencing sequence of the passive device IDs in each S _ PWR group item is compared, and the sequencing of the passive device IDs is performed according to a majority decision principle, wherein the passive device IDs are more close to the space of the active device, the signal strength value received by the passive device is larger, and conversely, after the sequencing of the signal strength and the majority decision principle of the passive device IDs, the passive device arranged in front is more close to the active device, the passive device is more suitable for the active device to perform wireless signal small-range coverage, and the passive device arranged behind is more far from the active device, the active device does not need to perform wireless signal coverage on the passive device IDs; after sorting the signal strength entries (see fig. 4), the passive device B is closest to the active device a, the passive device C is next to the passive device B, and the passive device F, G is farthest from the active device a according to the sorted order.

After finishing sequencing the detection data, the active device a performs step S25 to confirm the transmission power, and determines how many passive devices the wireless signal of the active device a needs to cover at least according to the actual wireless networking requirement of the wireless network device, and directly searches and compares the passive device ID in each group and the passive device ID that needs to cover actually from the 18 th detection data grouping result of the present invention in the order from small to large of S _ PWR, when the passive device ID in the search and comparison group can contain the passive device ID that needs to cover actually, the S _ PWR of the group is the wireless signal transmission power that the active device a covers in a small range of the wireless signal, and when the wireless network device a performs normal wireless networking communication, the wireless networking communication is performed with the S _ PWR wireless transmission power.

After the transmission power is confirmed, the active device a needs to perform step S26 network configuration information forwarding table confirmation, and arranges the passive device B, C, D according to the probe data sorting result and the distance order to perform the information forwarding table of the wireless network configuration.

In the step S27, in the cyclic diffusion networking, after the active device a completes transmission power confirmation and networking information forwarding table confirmation, the device B closest to the device a is used as the active device to repeat the operations of the steps S21 to S26, and the wireless transmission power self-detection calculation and small signal expansion networking are performed according to the same method; the transmission power confirmation and the diffusion networking of the device C, D, E, F, G … … are thus performed by means of cyclic repetitive diffusion.

When the variable power signal is detected, the number N of detection frames sent by the active device and the value of power reduction/power increase PWR _ STEP during each variable power detection can be determined according to the detection time and detection precision of the device, and the value of N can be larger and the value of PWR _ STEP can be smaller on occasions needing high detection precision and fixed wireless devices; in the situation that the wireless device needs to be detected and moved in a short time, the value of N can be slightly smaller, and the value of PWR _ STEP is larger.

When high-reliability wireless networking communication is needed, in order to avoid interference of an external environment of the wireless communication, after the calculation and confirmation of the wireless transmission power S _ PWR of the active device are completed, the S _ PWR + PWR _ STEP is used as a final S _ PWR for wireless networking communication, so that the wireless network device is ensured to have enough transmission power to perform wireless signal small-range coverage.

When detecting data packets, if the frame loss rate in the signal strength entry is greater than 50%, it indicates that the active device cannot perform stable and reliable wireless communication with the passive device under the transmission power, and compares other signal strength entries to determine whether the active device and the passive device have a communication fault problem.

According to the method, all passive devices B, C, D, E, F, G … … which communicate with the active device A are sorted according to the signal strength value, the higher the signal strength value is, the better the signal quality of the networking is represented, the higher the device sorting is, even if the device signal quality of the passive device close to the active device A in the physical space is poor due to the hardware fault of the device, the space obstruction and the like under special conditions, and the device signal quality of the device far away is better when the device is transmitted, the passive device with the high signal strength value and the good signal quality is still preferentially selected as the device for wireless data transmission and data forwarding, so that the communication performance and the data forwarding performance of the wireless networking are not influenced logically.

The key innovation points of the invention are as follows:

1. by adopting detection data exchange, the communication distance between the passive equipment and the active equipment is calculated according to the received signal strength of the passive equipment;

2. the detection data are sequenced, so that the distance identification of the passive equipment is completed;

3. the direction problem of the passive equipment near the active equipment is solved by adopting detection data exchange;

4. by detecting the variable power signal, the minimum wireless small signal coverage range can be automatically calculated according to the number of devices needing wireless coverage in practice;

5. after the small-range calculation of the wireless signals of the equipment is finished, even under the condition that the actual physical distance changes, as long as the logical signal strength is unchanged, the small-range coverage of the calculated wireless signals does not influence the wireless communication and data forwarding among the equipment, and the frequent adjustment of the power and data forwarding of the equipment caused by the change of the physical distance due to the movement of the equipment is not needed.

Compared with the prior art, the invention has the following advantages:

1. each wireless network device can be measured and calculated in a self-detection mode, and wireless communication is carried out by adopting the minimum wireless transmitting power on the premise of ensuring the reliable communication of the wireless network devices.

2. The wireless network equipment can adaptively select the most reasonable wireless transmitting power under different actual installation environments.

3. For wireless network equipment with a longer distance or a higher communication packet loss rate, the wireless network equipment can be intuitively classified into a category with unreliable wireless communication according to the signal intensity items, and the wireless network communication fault can be conveniently checked.

4. The communication distance of the wireless network equipment can be measured and calculated in a diffusion networking mode, the wireless network information forwarding table can be confirmed in an automatic networking mode, the step of manually configuring the networking information forwarding table is omitted, and networking automation is achieved.

The present invention may be implemented using different CPU processors and wireless communication modules, and the following detailed description of the devices used in the present invention will be made with reference to a specific embodiment.

The equipment used in the method consists of the following parts (as shown in figure 5): 1. the system comprises a CPU processor, an STM32F103RB chip is adopted, a 128Kbyte FLASH storage space and a 20Kbyte RAM storage space are arranged in the chip processor, the FLASH storage space is divided into 2 64Kbyte storage spaces in the embodiment, the first 64Kbyte storage space is used for storing execution codes of the CPU processor, the second FLASH storage space is used for storing storage type signal strength items, each storage type signal strength item occupies 12Byte spaces and at least can store 5120 storage type signal strength items, the equipment is not lost when power is cut off and reset restart is carried out, and the equipment can quickly recover the wireless small signal transmitting power of the equipment as required after the equipment is power cut off or reset restart is ensured; the transmission type signal intensity items generated in the process of carrying out variable power signal detection are stored in a RAM storage space, and each transmission type signal intensity item occupies 4 bytes, so that at least 4000 transmission type signal intensity items can be stored; 2. the wireless communication module adopts an SX1278 wireless communication module to receive and transmit wireless signals, when the wireless communication module is not externally connected with an external power amplifier, the maximum transmitting power of a hardware device of the wireless communication module is 20dbm, and the receiving sensitivity can be as high as-140 dbm; 3. the external FLASH memory adopts an M25P32 chip and has a FLASH storage space with 4Mbyte, is a non-essential device, has a large number of wireless network devices in a small airspace range and requires high detection precision when variable power signal detection is carried out, the external FLASH memory is required to store storage type signal strength items when a PWR _ STEP value is small, and in addition, the small-range coverage application of general wireless network signals can be met by utilizing the FLASH space in the CPU processor; for wireless network equipment with huge quantity in a small airspace range, a FLASH memory with a larger capacity and an SPI interface can be adopted, or an SPI bus interface is adopted to be connected with a plurality of FLASH memories with large capacity to store more storage type signal intensity items; 4. the direct current power supply management chip is used for a CPU processor, a wireless communication module and an external FLASH memory.

At least 4000 items of transmission type signal strength can be stored in a RAM storage space of 20Kbyte in a CPU processor, the maximum transmission power of an SX1278 wireless communication module according to the embodiment is 20dbm, each PWR _ STEP is calculated as 3dbm, when a variable power signal is detected, 9 stages of transmission power including 20dbm, 17dbm, 14dbm, 11dbm, 8dbm, 5dbm, 2dbm, -1dbm and-4 dbm are used for detecting the variable power signal, only 9 items of signal strength are generated in each detection of the variable power signal, each passive device only needs to store 9 items of transmission type signal strength at most, and the RAM storage space in the CPU processor can simultaneously accommodate at least 400 frames of power detection sent by the active devices; if the time-sharing storage mode is adopted, an unlimited number of active devices can be stored to send power detection frames to the active devices.

The invention sets a unique 8-byte equipment ID number on each equipment to distinguish the identity of each equipment; writing a unique 8-byte ID into a FLASH in a CPU processor chip of the equipment in the production process of the equipment; when the active device carries out wireless network transmission power self-detection, the ID serial number of the device is sent to the passive device by a power detection frame, which indicates that the ID of the device carries out wireless transmission by power PWR _ SEND; since 8 bytes of device ID will occupy too much memory space during signal entry storage, in some small number of wireless networking applications, the device ID may be set to 4 bytes to represent the unique identity of the device, or may use 4 bytes or 2 bytes of address of the device to represent the unique identity of the device in a local range space.

In order to improve the anti-interference performance of a power detection frame, a detection data request frame and a detection data transmission frame, a fixed 2-byte frame header is adopted before each type of frame, and the frame header takes the value of 0 xFFFA; the frame type is represented by 1 byte, 0x01 represents a power probe frame, a 0x02 probe data request frame and a 0x03 probe data transmission frame; each type of frame is checked for frame correctness using a CRC16 check code.

In order to improve the wireless signal transmission efficiency, the power detection frame adopts a fixed 16-byte short frame length, and each power detection frame adopts continuous wireless signals to be rapidly transmitted, because each PWR _ SEND transmission power frame is transmitted for N times, when the power detection frame is received in passive equipment, a small amount of power detection frames are lost, and the whole detection effect and the self-detection of the small-range coverage of wireless signal transmission power signals cannot be influenced.

The probe data request frame adopts a fixed 30-byte short frame length to send a request command of probe data, the active device can send the request command of probe data at any time except the sending period of the power probe frame when the active device sends the request command of probe data, and can send a plurality of request frames, the request sequence number of each request time is added with 1 to tell the passive device that the request has been sent for a plurality of times; the requesting device ID in the frame is used for indicating that the device requests the probe data, the active device ID and the passive device ID in the frame are used for indicating the signal strength item probe data generated by the power probe frame which is requested to be sent to the passive device by the active device, the requesting device ID and the active device ID both fill the active device ID of the power probe frame, and the passive device ID fills the passive device ID of the request in the probe data exchange process; therefore, the probe data request frame can well meet the probe data exchange task through the design of three device IDs.

The detection data transmission frame adopts a length-variable frame to transmit signal intensity items, and only one signal intensity item generated by a functional detection frame sent to one passive device by one active device is transmitted in one frame; the active device ID and the passive device ID in the frame are used to respectively indicate the active device ID of the transmission power detection frame and the passive device ID of the reception power detection frame of the signal strength entry, and the transmission is performed in a broadcast wireless signal manner, all devices in the airspace can receive the transmission frame, when the passive device B performs a detection data exchange process to the active device a for transmitting a signal strength entry, the device C can also receive a detection data exchange entry between the device B and the device a, and when the signal strength entry from the active device D to the passive device E is transmitted, the device A, B, C can receive the frame as an entry for detection data exchange, so that the wireless communication broadcast advantage can be fully utilized to reduce the number of times of the detection data exchange entries, and the communication efficiency of the wireless network is improved.

The maximum frame length of a detection data transmission frame is 512 bytes, one frame can transmit 122 signal strength items at most, the detection frame can transmit a variable power signal detection frame with the maximum transmission power of 116dbm according to the calculation that each PWR _ STEP is 1dbm, and the transmission power is large enough to cover all wireless signal transmitters in the application of the Internet of things.

The above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make variations, modifications, additions or substitutions within the technical scope of the present invention.

Claims

1. A small signal diffusion networking method of wireless network equipment is characterized in that: the method comprises the following steps:

the overall steps of the self-detection are as follows:

2. The small-signal-spreading networking method for wireless network devices according to claim 1, wherein: in the variable power signal detection process of step S21, the variable power sends a power detection frame according to the transmission power from large to small, that is, the variable power performs variable power detection by reducing the power by half according to the reduction of the transmission power by 3dbm each time; the variable power mode can effectively cover all variable power and as many passive devices as possible, and the signal detection precision is highest; the method is used for first networking time-varying function detection.

3. The small-signal-spreading networking method for wireless network devices according to claim 1, wherein: in the variable power signal detection process of step S21, the variable power sends a power detection frame according to the transmission power from small to large, that is, the variable power performs variable power detection according to each transmission power increase of 3dbm, that is, the power increase is doubled; the variable power mode can reach the preset low-power signal value at the fastest speed, and the signal detection speed is the fastest; the method is used for carrying out repeated variable power detection under the condition that the small signal transmission power is determined after networking.

4. The small-signal-flooding networking method for wireless network devices of claim 2 or 3, characterized in that: in the variable power signal detection process of STEP S21, the number N of detection frames sent by the active device and the value of PWR _ STEP for power reduction/power increase during each variable power detection may be determined according to the detection time and detection accuracy of the device, and in the case where high detection accuracy and fixed wireless device are required, the value of N is larger and the value of PWR _ STEP is smaller; in the occasion of needing shorter time to finish detection and move the wireless equipment, the value of N is smaller, and the value of PWR _ STEP is larger.

5. The small-signal-spreading networking method for wireless network devices of claim 4, wherein: in order to reduce the interference of wireless signals, all devices in a wireless airspace are allowed to continue to start the suspended wireless communication task as long as the current wireless communication task is completely suspended after a frame of power detection frame is received, the silent receiving mode is entered, the silent time is 3 seconds, and after 3 seconds, any power detection frame is not received; the mechanism can preferentially ensure the wireless signal transmission of the power detection frame, reduce the interference of wireless signal small-range coverage self-detection and improve the self-detection precision.

6. The small-signal-spreading networking method for wireless network devices according to claim 1, wherein: the signal strength entries in the step S21 are divided into storage type signal strength entries and transmission type signal strength entries; the storage type signal strength item is used for recording the signal strength of a wireless signal sent to the passive device by the active device, and comprises five parts, namely transmitting power, an average value of received signal strength, a minimum value of received signal strength, the number of received lost frames and the receiving device; the transmitting power is the transmitting power of a wireless signal when the active device sends information, the average value of the received signals is the average value of the signal strength of the wireless signal of the active device received by the passive device, the minimum value of the received signal strength is the minimum value of the signal strength of the wireless signal of the active device received by the passive device, the receiving frame loss quantity R is the data of how many active devices are lost by the passive device, and the receiving device is the ID serial number of the passive device; the transmission type signal intensity item is designed for improving the wireless transmission efficiency, omits a receiving device compared with a standard signal intensity item, and is mainly used for rapidly transmitting signal intensity data between an active device and a passive device so as to improve the wireless transmission efficiency.

7. The small-signal-spreading networking method for wireless network devices of claim 6, wherein: the communication frames of the signal intensity items in data exchange and transmission comprise a power detection frame, a detection data request frame and a detection data transmission frame; the power detection frame is used for detecting the wireless transmission power of the active equipment and comprises a frame header, a frame type, the total number of sent frames, a sent frame sequence number, the transmission power of the detection frame, the ID of the active equipment of the detection frame and the CRC check; the detection data request frame is used for the active equipment to request a signal strength item from the passive equipment, and comprises a frame header, a frame type, a request frame sequence number, a request equipment ID, an active equipment ID, a passive equipment ID and CRC (cyclic redundancy check) check; the detection data transmission frame is used for transmitting signal intensity items from the passive equipment to the active equipment, and comprises a frame head, a frame type, a total signal intensity, the number of the signal intensity items of the current frame, a signal intensity item serial number, items 1-n, a request frame active equipment ID, a response frame passive equipment ID and CRC (cyclic redundancy check); in order to save frame space and improve wireless transmission efficiency, the signal strength entries in the probe data transmission frame are transmitted by using transmission type signal strength entries.

8. The small-signal-spreading networking method for wireless network devices according to claim 1, wherein: the active equipment and the passive equipment are named in the single signal detection process, and only one active equipment is provided and any number of passive equipment is provided in the wireless signal transmission power self-detection process of each equipment node; in the whole wireless network, self-detection is carried out from gateway equipment, and then, self-detection is carried out by taking passive equipment closest to the gateway active equipment as active equipment.