Inclined elevator safety wireless communication method and system based on Internet technology

Abstract

The invention relates to the technical field of digital information transmission, in particular to an inclined elevator safety wireless communication method and system based on the Internet technology, and the method comprises the steps: building a WIFI communication network in an area where an inclined elevator is located, and presetting an evaluation period; acquiring a first characteristic value and a second characteristic value of each link in each period, and acquiring a third characteristic value of each link by combining the total throughput of all routers in each link with the total average queuing delay of the data packets; recording the communication link from the inclined elevator to the main gateway in each period as a main link; measuring whether each main link is congested or not; respectively acquiring link measurement results of each link in the current period when the main link is congested and not congested; and carrying out routing selection according to the OSPF protocol. According to the method, the network change is responded in time, the optimal transmission path is selected, it is ensured that a transmission guarantee with the higher priority is provided for safe wireless communication of the inclined elevator, and then the real-time performance of safe monitoring of the inclined elevator is ensured.

Description

Technical Field

[0001] This application relates to the field of digital information transmission technology, specifically to a method and system for safe wireless communication of inclined elevators based on Internet technology. Background Technology

[0002] Inclined escalators are special elevators that run along inclined tracks, achieving diagonal movement through track design. They are widely used in scenic areas with complex terrain, such as mountain tourist areas and ski resorts. Due to the special operating environment of inclined escalators, the early signs of potential faults are often subtle, such as track deformation, making them difficult to detect directly from sensor data. Therefore, current methods often use internet-based wireless communication to transmit the escalator's operating data to a cloud monitoring platform in real time. Data analysis algorithms then identify potential faults and apply brakes in a timely manner to reduce safety hazards. However, when the flow of people in scenic areas increases, the pressure on internet communication surges, potentially leading to network congestion. This can affect the transmission of inclined escalator operating data, resulting in a decrease in the real-time performance of safety monitoring for inclined escalators.

[0003] Publication No. CN117640380A discloses a method and system for switching transmission rates of a wireless router. Its core lies in dynamically adjusting the communication frequency band and transmission path of devices through topology analysis, spatiotemporal sensing signal analysis, neural network prediction, genetic optimization, and rate compensation, thereby optimizing network performance. However, this method is overly complex in adjusting transmission paths. In scenic areas with network congestion, the large computational load may lead to an inability to respond promptly to network changes. Furthermore, it fails to fully consider the large operating range of inclined elevators and the significant differences in wireless communication environments at different locations. The constructed wireless network topology cannot accurately describe the wireless signal transmission characteristics of the elevator at different locations, thus affecting the effectiveness of subsequent transmission path optimization. In addition, it does not fully consider the different network requirements of different types of devices in the scenic area network environment, failing to provide a priority transmission strategy for safe wireless communication of inclined elevators. Ultimately, this results in the inability to guarantee the real-time performance of safety monitoring for inclined elevators. Summary of the Invention

[0004] In view of the above, it is necessary to provide a method and system for safe wireless communication of inclined elevators based on Internet technology. Compared with traditional Internet-based methods for safe wireless communication of inclined elevators, this method can respond to network changes in a timely manner, select the optimal transmission path, and ensure higher priority transmission guarantees for safe wireless communication of inclined elevators, thereby ensuring the real-time nature of safety monitoring of inclined elevators. In a first aspect, embodiments of this application provide a safe wireless communication method for inclined elevators based on Internet technology, the method comprising the following steps: A WIFI communication network is established in the area where the inclined elevator is located, and the evaluation period of each link is preset, referred to as the period; The first characteristic value of each link is obtained by measuring the signal strength of the transmitted signal of the first wireless router in each link within each period at the mobile terminal, and the number of mobile terminals connected to the first wireless router. The second characteristic value of each link is obtained by combining the number of mobile terminals connected to each wireless router in each link with the growth of the number of mobile terminals connected and the throughput of each wireless router in each period and a preset number of periods before it. The third characteristic value of each link is obtained by using the first characteristic value, the second characteristic value, the total throughput of all routers in each link, and the total average queuing delay of data packets. The communication links from the inclined elevator to the main gateway in the WIFI communication network within each period are denoted as each main link. The congestion status of each main link is measured by the average queuing delay of data packets from wireless routers in each main link. If the main link was not congested in the previous period, the third characteristic value of each link in the current period is used as the link measurement result for each link in the current period. Otherwise, the measurement value of the main link in the previous period in the current period is obtained by comparing the average level of the average queuing delay of data packets from all wireless routers in the main link in the previous period with a preset delay threshold, and by using the third characteristic value of the main link in the previous period. The link measurement result for each link in the current period is obtained by combining the third characteristic value of each link in the current period with the measurement value. Based on the link metric results, routes are selected according to the OSPF protocol.

[0005] In one embodiment, the first characteristic value is a normalized value of the ratio of the number of mobile terminals connected to the first wireless router to the signal strength.

[0006] In one embodiment, the process of obtaining the second feature value is as follows: The preceding preset number of consecutive cycles adjacent to each cycle, as well as each cycle, are used as reference evaluation cycles for each cycle; the throughput of each wireless router in each link within all reference evaluation cycles of each cycle is arranged in time sequence to form the throughput sequence of each wireless router in each link in each cycle; the slope of the fitted straight line of each throughput sequence is obtained. The difference between the number of mobile terminals connected to each wireless router in each link during the first reference evaluation period of each cycle and the number of mobile terminals connected during the last reference evaluation period is obtained. The second feature value can be further obtained through the slope, the difference, and the number.

[0007] In one embodiment, the second feature value is calculated as follows: Calculate the ratio of the difference to the number, and take the opposite of the ratio and the slope as the exponent of an exponential function with a preset value greater than 1 as the base, to obtain the inverse proportional mapping result of the ratio and the direct proportional mapping result of the slope. Calculate the product of the inverse proportional mapping result and the direct proportional mapping result; The second characteristic value is the mean of the products of all wireless routers in each link.

[0008] In one embodiment, the process of obtaining the third feature value is as follows: Calculate the sum of the throughput of all routers in each link; Calculate the cumulative average queuing delay of data packets for all routers in each link; The third feature value is positively correlated with the first feature value, the second feature value, the sum value, and the accumulated value.

[0009] In one embodiment, the third feature value is calculated as follows: Calculate the normalized value of the sum, the product of the first eigenvalue and the second eigenvalue; Calculate the normalized result of the opposite of the accumulated value; The third characteristic value is the ratio of the product value to the normalization result.

[0010] In one embodiment, the method for measuring whether each main link is congested is as follows: Calculate the average queuing delay of data packets from all wireless routers in each main link. If the average delay is less than or equal to a preset delay threshold, determine that each main link is not congested; otherwise, determine that each main link is congested.

[0011] In one embodiment, the process of obtaining the metric value is as follows: Obtain the ratio calculation result of the difference amount and the preset time delay threshold; use the ratio calculation result as the exponent of the exponential function with the natural constant as the base to obtain the exponential function mapping result of the ratio; The metric is the product of the result of the exponential function mapping and the third characteristic value of the main link in the previous period.

[0012] In one embodiment, obtaining the link metric result for each link in the current period by using the third feature value of each link in the current period and the metric value includes: For each link in the current period other than the main link in the previous period, the third feature value of each link in the current period is used as the link measurement result of each link in the current period. For the main link in the previous period within the current period, the sending end of the data packet is identified through the IP protocol. When the sending end of the data packet is the inclined elevator, the metric value is used as the link metric result of the main link in the previous period within the current period. When the data packet is sent by a mobile terminal other than the inclined elevator, the third characteristic value of the main link in the previous period in the current period is used as the link measurement result of the main link in the previous period in the current period.

[0013] Secondly, embodiments of this application also provide a safety wireless communication system for inclined elevators based on Internet technology, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any of the above-described safety wireless communication methods for inclined elevators based on Internet technology.

[0014] This application has at least the following beneficial effects: This application, through a preset evaluation cycle, can periodically monitor network status and promptly identify potential problems. By calculating the signal strength of the first wireless router in each link and the number of connected mobile terminals, a first characteristic value can be obtained, reflecting the link's communication load and signal transmission reliability. By calculating a second characteristic value, considering both the actual and potential communication load of the link, the application can accurately reflect the changing trend of the link's communication load. By combining the first and second characteristic values, total throughput, and average queuing delay of data packets, the application can comprehensively quantify the link's communication status. This is beneficial for prioritizing links with less saturated communication status during routing, thereby achieving load balancing and avoiding network congestion. Furthermore, by monitoring the average queuing delay of the main link, it is possible to detect whether the main link is congested in a timely manner. If the main link is congested, the link metric results of the main link are adjusted to avoid further aggravating the congestion. By using the link metric results of each link for load distribution and dynamic routing selection, on the one hand, it can avoid network fluctuations and network congestion caused by unfair routing selection when the network is relatively stable; on the other hand, when the network is congested, it can ensure that higher priority transmission guarantees are provided for the safe wireless communication of the inclined elevator, thereby ensuring the real-time nature of safety monitoring for the inclined elevator. Attached Figure Description

[0015] To more clearly illustrate the technical solutions and advantages in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A flowchart illustrating the steps of a safe wireless communication method for inclined elevators based on Internet technology, as provided in one embodiment of this application; Figure 2 This is a schematic diagram illustrating the process of obtaining the third eigenvalue. Detailed Implementation

[0017] In the description of the embodiments in this application, the words "exemplary," "or," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of the words "exemplary," "or," and "for example" is intended to present the relevant concepts in a specific manner.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. It should be understood that, unless otherwise stated, " / " in this application means "or".

[0019] It should also be noted that the terms "first" and "second" in this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0020] The following description, in conjunction with the accompanying drawings, details the specific scheme of the inclined elevator safety wireless communication method and system based on Internet technology provided in this application.

[0021] Please see Figure 1 The diagram illustrates a flowchart of a method for safe wireless communication of inclined elevators based on Internet technology, according to an embodiment of this application. The method includes the following steps: Step 1: Establish a WIFI communication network in the area where the inclined elevator is located.

[0022] This application establishes a WIFI communication network in the area where the inclined elevator is located based on Internet technology, ensuring that the elevator can maintain stable communication with the cloud monitoring platform during operation and enabling timely identification of potential faults.

[0023] First, install a wireless router supporting 802.11ac or higher standards near the inclined elevator track as a wireless access point (AP) to ensure high bandwidth and stability for safe wireless communication of the inclined elevator.

[0024] Secondly, use a WIFI analysis tool, such as NetSpot, to test the signal coverage of each AP to ensure that the inclined elevator can connect to at least 3 APs at any location to meet network redundancy requirements.

[0025] Finally, in this embodiment, a wireless router is installed at the starting station of the inclined elevator as the main gateway, connected to the cloud monitoring platform. Simultaneously, a static IP address is assigned to the wireless router serving as the main gateway to ensure its communication with the cloud server, and the OSPF dynamic routing protocol is enabled among all access points (APs) to achieve automatic routing optimization for subsequent network operations.

[0026] Wireless terminal devices, such as wireless network cards, are installed inside the inclined elevator to access a Wi-Fi communication network. Simultaneously, encoders are installed on the elevator's drive wheels to record the number of rotations and direction to obtain the elevator's travel distance. The elevator's position is then transmitted in real-time to a cloud monitoring platform via the Wi-Fi communication network.

[0027] Starting from the starting station of the inclined elevator, the inclined elevator track is evenly divided into track sections of equal length. In this embodiment, the length of the track section is 20m. The implementer can set the length of the track section according to the actual situation, and this application does not impose any special restrictions. For each track section, the midpoint of the track section is recorded as its reference position, and the signal strength of the AP that can be accessed at the reference position is obtained for subsequent switching between the wireless terminal equipment of the inclined elevator and the AP near the track.

[0028] Step 2: Preset the evaluation period for each link in the WIFI communication network. For each evaluation period, measure the communication status of each link by the throughput of each wireless router, the average queuing delay of data packets, and the number of connected mobile terminals.

[0029] In the network environment of a scenic area's inclined elevator, when increased pedestrian traffic leads to network congestion, the status of different links can be assessed by monitoring the performance indicators of the access points (APs), and the dynamic routing selection of the OSPF protocol can be adjusted based on the link status of the Wi-Fi communication network. Specifically, this embodiment sets the assessment period to 1 second. Implementers can set the specific value of the assessment period according to actual conditions; this application does not impose any special restrictions. The throughput of the wireless router, the average queuing delay of data packets, and the number of connected mobile terminals within the assessment period are used as performance indicators for assessing different link states.

[0030] Unlike general communication networks, inclined elevators have two main characteristics. First, they operate over a large area and switch between Wi-Fi networks multiple times during a single trip, requiring stable network switching. Second, the visitor flow in scenic areas where inclined elevators are located changes rapidly, directly affecting the communication status of different links.

[0031] Network performance metrics are collected via wireless routers and uploaded to a cloud monitoring platform. The cloud server dynamically adjusts the network link measurement strategy based on changes in these metrics and distributes the different link measurement results to each wireless router via Wi-Fi communication, thereby reducing frequent network switching, avoiding network congestion, and improving network stability.

[0032] Step 2.1: Obtain the first characteristic value of each link by the signal strength of the transmitted signal of the first wireless router in each link within each period at the mobile terminal, and the number of mobile terminals connected to the first wireless router.

[0033] First, for any link in the Wi-Fi communication network, the first characteristic value of that link within the current evaluation period is obtained by using the signal strength of the transmitted signal of the first wireless router in that link at the mobile terminal, and the number of mobile terminals connected to the first wireless router in that link. The expression is as follows: In the formula, Fa represents the first characteristic value of any link within the current evaluation period; norm() represents the normalization operation; N represents the number of mobile terminals connected to the first wireless router in any link; and R represents the signal strength of the transmitted signal of the first wireless router in any link at the mobile terminal. The wireless routers are numbered according to their order in the link.

[0034] In this embodiment, the Min-Max normalization method is used to... Perform normalization processing; Let be the characteristic coefficient of any link. Based on the characteristic coefficients of all links in the current evaluation period, the normalized value of the characteristic coefficients of each link in the current evaluation period is obtained by using the formula of the Min-Max normalization method. The formula of the Min-Max normalization method is well known and will not be described in this application.

[0035] It should be noted that the smaller the calculated first characteristic value, the smaller the communication load between the first link and its mobile terminal, and the higher the reliability of signal transmission.

[0036] The first characteristic value of each link in each evaluation period is calculated using the same calculation method as the first characteristic value of any link in the current evaluation period.

[0037] Step 2.2: By using the number of mobile terminals connected to each wireless router in each link, and combining the growth of the number of mobile terminals connected to each wireless router and the throughput in each period and a preset number of previous periods, the second characteristic value of each link is obtained.

[0038] For any given evaluation period, a predetermined number of consecutive evaluation periods adjacent to that evaluation period, along with the evaluation period itself, are used as reference evaluation periods to analyze the changing trends of the link communication status. When the number of evaluation periods preceding any given evaluation period is insufficient, Newton interpolation is used to supplement the missing reference evaluation periods based on the throughput, average queuing delay of packets, and number of connected mobile terminals within all reference evaluation periods of that evaluation period. Newton interpolation is a well-known technique and will not be elaborated upon here. It should be noted that for the first evaluation period, since data exists only within one reference evaluation period, Newton interpolation cannot be applied. Therefore, a value identical to the throughput within the first evaluation period is used to supplement the missing reference evaluation periods of the first evaluation period, and the same supplementation method is used to supplement the average queuing delay of packets and the number of connected mobile terminals within the missing reference evaluation periods of the first evaluation period.

[0039] In this embodiment, the number of reference evaluation periods for any evaluation period is 300. The number of reference evaluation periods can be limited by the implementer according to the actual situation, and this application does not impose any special restrictions.

[0040] On the one hand, the throughput of the wireless router in any link reflects the communication load of that link. When the throughput of the wireless router increases, the communication load of that link increases. On the other hand, the number of mobile terminals connected to the wireless router in any link reflects the potential communication load of that link. When the number of mobile terminals connected to the wireless router increases, the potential communication load of that link increases. The faster the growth rate of the wireless router's throughput and the number of connected mobile terminals, the greater the impact of passenger flow on the communication load of that link.

[0041] This application arranges the throughput of each wireless router in any given link across all reference evaluation periods in the current evaluation period in chronological order, forming a throughput sequence for each wireless router in the given link during the current evaluation period. A fitted straight line is obtained for each throughput sequence, and the slope of the fitted straight line is calculated. The slope reflects the trend of throughput change of the wireless routers. The method for calculating the slope of the fitted straight line is a well-known technique and will not be elaborated upon in this application.

[0042] In this embodiment, the least squares method is used to obtain the fitted line of each throughput sequence. Specifically, for each throughput sequence, each element in the throughput sequence and its index in the throughput sequence are used to form each data point, where the index is the horizontal axis and the element is the vertical axis. All data points corresponding to the throughput sequence are used as the input of the least squares method, and the fitted line of all data points is output. The least squares method is a well-known technique and will not be described in detail in this application. As other implementation methods, based on the ability to measure the fitted line of each throughput sequence, the implementer may use other existing techniques, such as weighted least squares, etc. This application does not impose any special restrictions.

[0043] By analyzing the number of mobile terminals connected to each wireless router in any link during the current evaluation period, combined with the growth in the number of mobile terminals connected to each wireless router across all reference evaluation periods, and the growth in the throughput of each wireless router across all reference evaluation periods, a second characteristic value is obtained for any link during the current evaluation period. This characteristic value reflects the degree of change in link communication status caused by changes in passenger flow within the scenic area where the inclined elevator is located. The expression is as follows: In the formula, Fb represents the second characteristic value of any link within the current evaluation period; M represents the number of wireless routers in any link; exp() represents an exponential function with the natural constant as the base, used to convert... and Mapped to positive numbers; This represents the difference between the number of mobile terminals connected to the m-th wireless router in the first reference evaluation period of the current evaluation period and the number of mobile terminals connected in the last reference evaluation period. This represents the number of mobile terminals connected to the m-th router in any given link during the current evaluation period; This represents the slope of the fitted straight line of the throughput sequence of the m-th router in any given link during the current evaluation period. The exponential function with a base of the natural constant is merely one embodiment of this application. As for other implementations, when the base of the exponential function is a preset value greater than 1, the implementer can set the specific value of the base as they see fit; this application does not impose any special restrictions.

[0044] It should be noted that the larger the calculated second characteristic value, the more significant the increase in communication load on any link, and the closer the link communication state is to saturation.

[0045] The second characteristic value of each link in each evaluation period is calculated using the same calculation method as that used for any link in the current evaluation period.

[0046] Step 2.3: Obtain the third characteristic value of each link by using the first characteristic value, the second characteristic value, the total throughput of all routers in each link, and the total average queuing delay of data packets.

[0047] When the network is lightly loaded, the queues are almost empty, so the queuing latency approaches zero. However, as the network approaches saturation, queuing increases significantly, leading to a sharp increase in queuing latency. Further increases in queue length can cause even more latency and may even result in packet loss.

[0048] The flow of visitors near the inclined escalator in the scenic area changes rapidly. The sudden increase in visitor volume causes a surge in communication pressure on the wireless router. When the wireless router is nearing congestion, throughput alone cannot reflect the changes in network link communication pressure in this scenario. This application utilizes the nonlinear changes in queuing delay under light-load and near-saturation conditions of the wireless router to improve the sensitivity of link metrics, so that subsequent routing selection can respond promptly to network changes.

[0049] Based on the above analysis, using the first and second characteristic values ​​of any link within the current evaluation period, the total throughput of all routers in any link within the current evaluation period, and the average queuing delay of data packets for all routers in any link within the current evaluation period, a third characteristic value is obtained for any link within the current evaluation period. This third characteristic value is used to quantify the communication state of any link, and its expression is: In the formula, Fc represents the third characteristic value of any link in the current evaluation period; norm() represents the normalization operation; Fa represents the first characteristic value of any link in the current evaluation period; Fb represents the second characteristic value of any link in the current evaluation period; Ta represents the sum of the throughput of all routers in any link in the current evaluation period; exp() represents the exponential function with the natural constant as the base, used to normalize (-Da); Da is the sum of the average queuing delays of data packets of all routers in any link in the current evaluation period.

[0050] In this embodiment, the Min-Max normalization method is used to normalize Ta; based on the sum of all links in the current evaluation period, the formula of the Min-Max normalization method is used to obtain the normalized value of the sum of each link in the current evaluation period. The formula of the Min-Max normalization method is well known and will not be described in detail in this application.

[0051] It should be noted that the sum of the throughput of all routers in any given link during the current evaluation period reflects the actual load capacity of that link. Higher throughput indicates a closer proximity to network saturation, resulting in a larger calculated third characteristic value for that link. Conversely, a smaller calculated third characteristic value indicates a better link, making it more suitable for subsequent OSPF routing to select the wireless routers within that link to achieve load balancing and avoid network congestion. A schematic diagram illustrating the process of obtaining the third characteristic value is shown below. Figure 2 As shown.

[0052] The third characteristic value of each link in each evaluation period is calculated using the same calculation method as that used for any link in the current evaluation period.

[0053] Step 3: Record the communication links from the inclined elevator to the main gateway in the WIFI communication network within each period as each main link; measure the congestion of each main link by the average queuing delay of data packets from the wireless routers in each main link; if the main link was not congested in the previous period, use the third characteristic value of each link in the current period as the link measurement result for each link in the current period; otherwise, obtain the measurement value of the main link in the previous period in the current period by comparing the average level of the average queuing delay of data packets from all wireless routers in the main link in the previous period with a preset delay threshold, and the third characteristic value of the main link in the previous period; obtain the link measurement result for each link in the current period by comparing the third characteristic value of each link in the current period with the measurement value; and perform route selection according to the OSPF protocol based on the link measurement results.

[0054] During the first evaluation period of establishing communication in the WIFI communication network, the third characteristic value of each link in the first evaluation period is used as the link metric result of each link in the first evaluation period, and routing is performed according to the OSPF protocol.

[0055] For the communication link from the inclined elevator to the main gateway, the average queuing delay of data packets of all wireless routers in the communication link from the inclined elevator to the main gateway is calculated in each evaluation period. When the average delay is less than or equal to a preset delay threshold, it is determined that the communication link from the inclined elevator to the main gateway is not congested in each evaluation period. In the next evaluation period, the third characteristic value of each link in the next evaluation period is still used as the link metric result of each link in the next evaluation period, and routing is performed according to the OSPF protocol. Among them, the communication link from the inclined elevator to the main gateway in the WIFI communication network in each evaluation period is recorded as the main link in each evaluation period. When the average value exceeds a preset latency threshold, the communication link between the inclined elevator and the main gateway is determined to be congested in each evaluation period, resulting in increased data transmission time in the WIFI communication network. In this case, the link measurement results need to be weighted to redistribute the load and ensure safe wireless communication for the inclined elevator. Taking the current evaluation period as an example, if the communication link between the inclined elevator and the main gateway was congested in the previous evaluation period, the measurement value of the communication link between the inclined elevator and the main gateway in the current evaluation period is obtained by comparing the average queuing latency of data packets from all wireless routers in the previous evaluation period with the preset latency threshold, and by using the third characteristic value of the communication link between the inclined elevator and the main gateway in the previous evaluation period. The expression is as follows: In the formula, This represents the measurement value of the communication link between the inclined elevator and the main gateway in the previous evaluation period in the current evaluation period; This represents the average queuing delay of data packets from all wireless routers in the communication link from the escalator to the main gateway during the previous evaluation period, reflecting the network congestion level of the communication link from the escalator to the main gateway; exp() represents an exponential function with the natural constant as the base, used to quickly increase the metric value of the communication link from the escalator to the main gateway in the early stage of network congestion, so as to avoid aggravating the congestion level of the communication link from the escalator to the main gateway. Indicates the preset delay threshold; This represents the third characteristic value of the communication link between the inclined elevator and the main gateway during the previous evaluation period.

[0056] In this embodiment, the preset delay threshold is set to 10ms. The preset delay threshold is set manually, and the implementer can limit it according to the actual situation. This application does not impose any special restrictions.

[0057] For each link in the current evaluation period, except for the communication link from the inclined elevator to the main gateway in the previous evaluation period, the third feature value of each link in the current evaluation period is used as the link measurement result of each of the remaining links in the current evaluation period. The IP protocol is used to identify the sender of data packets.

[0058] For the communication link between the inclined elevator and the main gateway in the previous evaluation period, when the sender of the data packet is the inclined elevator, the measurement value of the communication link between the inclined elevator and the main gateway in the previous evaluation period in the current evaluation period is used as the link measurement result of the communication link between the inclined elevator and the main gateway in the previous evaluation period in the current evaluation period. When the data packet sender is a mobile terminal other than the inclined elevator, the third characteristic value of the communication link from the inclined elevator to the main gateway in the previous evaluation period in the current evaluation period is used as the link measurement result of the communication link from the inclined elevator to the main gateway in the previous evaluation period in the current evaluation period.

[0059] Furthermore, for the communication link between the inclined elevator and the main gateway, the inclined elevator only performs network switching when it reaches the midpoint of the track section. By setting fixed switching nodes at the inclined elevator's running track, the switching process of the wireless communication network is optimized based on signal strength distribution and communication load changes, thereby improving the stability and reliability of communication switching.

[0060] Based on the same inventive concept as the above methods, this application also provides a safety wireless communication system for inclined elevators based on Internet technology, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, it implements the steps of any one of the above-described methods for safety wireless communication of inclined elevators based on Internet technology.

[0061] In summary, this application, through a preset evaluation cycle, can periodically monitor network status and promptly identify potential problems; by calculating the first characteristic value based on the signal strength of the first wireless router in each link and the number of connected mobile terminals, it can reflect the communication load and signal transmission reliability of the link; by calculating the second characteristic value, considering the actual and potential communication load of the link, it can accurately reflect the changing trend of the link's communication load; by combining the first characteristic value, the second characteristic value, the total throughput, and the average queuing delay of data packets, it can comprehensively quantify the communication status of the link, which is beneficial for prioritizing links with less saturated communication status during routing to achieve load balancing and avoid network congestion; Furthermore, by monitoring the average queuing delay of the main link, it is possible to detect whether the main link is congested in a timely manner. If the main link is congested, the link metric results of the main link are adjusted to avoid further aggravating the congestion. By using the link metric results of each link for load distribution and dynamic routing selection, on the one hand, it can avoid network fluctuations and network congestion caused by unfair routing selection when the network is relatively stable; on the other hand, when the network is congested, it can ensure that higher priority transmission guarantees are provided for the safe wireless communication of the inclined elevator, thereby ensuring the real-time nature of safety monitoring for the inclined elevator.

[0062] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0063] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from its essential characteristics. Therefore, the embodiments described above should be considered exemplary and non-limiting in all respects.

Claims

1. A safe wireless communication method for inclined elevators based on Internet technology, characterized in that, The method includes the following steps: A WIFI communication network is established in the area where the inclined elevator is located, and the evaluation period of each link is preset, referred to as the period; The first characteristic value of each link is obtained by measuring the signal strength of the transmitted signal of the first wireless router in each link within each period at the mobile terminal, and the number of mobile terminals connected to the first wireless router. The second characteristic value of each link is obtained by combining the number of mobile terminals connected to each wireless router in each link with the growth of the number of mobile terminals connected and the throughput of each wireless router in each period and a preset number of periods before it. The third characteristic value of each link is obtained by using the first characteristic value, the second characteristic value, the total throughput of all routers in each link, and the total average queuing delay of data packets. The communication links from the inclined elevator to the main gateway in the WIFI communication network within each period are denoted as each main link. The congestion status of each main link is measured by the average queuing delay of data packets from wireless routers in each main link. If the main link was not congested in the previous period, the third characteristic value of each link in the current period is used as the link measurement result for each link in the current period. Otherwise, the measurement value of the main link in the previous period in the current period is obtained by comparing the average level of the average queuing delay of data packets from all wireless routers in the main link in the previous period with a preset delay threshold, and by using the third characteristic value of the main link in the previous period. The link measurement result for each link in the current period is obtained by combining the third characteristic value of each link in the current period with the measurement value. Based on the link metric results, routes are selected according to the OSPF protocol.

2. The method for safe wireless communication of inclined elevators based on Internet technology as described in claim 1, characterized in that, The first characteristic value is the normalized value of the ratio of the number of mobile terminals connected to the first wireless router to the signal strength.

3. The safe wireless communication method for inclined elevators based on Internet technology as described in claim 1, characterized in that, The process of obtaining the second feature value is as follows: The preceding preset number of consecutive cycles adjacent to each cycle, as well as each cycle, are used as reference evaluation cycles for each cycle; the throughput of each wireless router in each link within all reference evaluation cycles of each cycle is arranged in time sequence to form the throughput sequence of each wireless router in each link in each cycle; the slope of the fitted straight line of each throughput sequence is obtained. The difference between the number of mobile terminals connected to each wireless router in each link during the first reference evaluation period of each cycle and the number of mobile terminals connected during the last reference evaluation period is obtained. The second feature value can be further obtained through the slope, the difference, and the number.

4. The safe wireless communication method for inclined elevators based on Internet technology as described in claim 3, characterized in that, The method for calculating the second eigenvalue is as follows: Calculate the ratio of the difference to the number, and take the opposite of the ratio and the slope as the exponent of an exponential function with a preset value greater than 1 as the base, to obtain the inverse proportional mapping result of the ratio and the direct proportional mapping result of the slope. Calculate the product of the inverse proportional mapping result and the direct proportional mapping result; The second characteristic value is the mean of the products of all wireless routers in each link.

5. The safe wireless communication method for inclined elevators based on Internet technology as described in claim 1, characterized in that, The process for obtaining the third feature value is as follows: Calculate the sum of the throughput of all routers in each link; Calculate the cumulative average queuing delay of data packets for all routers in each link; The third feature value is positively correlated with the first feature value, the second feature value, the sum value, and the accumulated value.

6. The safe wireless communication method for inclined elevators based on Internet technology as described in claim 5, characterized in that, The method for calculating the third eigenvalue is as follows: Calculate the normalized value of the sum, the product of the first eigenvalue and the second eigenvalue; Calculate the normalized result of the opposite of the accumulated value; The third characteristic value is the ratio of the product value to the normalization result.

7. The safe wireless communication method for inclined elevators based on Internet technology as described in claim 1, characterized in that, The method for measuring whether each main link is congested is as follows: Calculate the average queuing delay of data packets from all wireless routers in each main link. If the average delay is less than or equal to a preset delay threshold, determine that each main link is not congested; otherwise, determine that each main link is congested.

8. The method for safe wireless communication of inclined elevators based on Internet technology as described in claim 1, characterized in that, The process for obtaining the measurement value is as follows: Obtain the ratio calculation result of the difference amount and the preset time delay threshold; use the ratio calculation result as the exponent of the exponential function with the natural constant as the base to obtain the exponential function mapping result of the ratio; The metric is the product of the result of the exponential function mapping and the third characteristic value of the main link in the previous period.

9. The safe wireless communication method for inclined elevators based on Internet technology as described in claim 1, characterized in that, The step of obtaining the link measurement result for each link in the current period by using the third feature value of each link in the current period and the measurement value includes: For each link in the current period other than the main link in the previous period, the third feature value of each link in the current period is used as the link measurement result of each link in the current period. For the main link in the previous period within the current period, the sending end of the data packet is identified through the IP protocol. When the sending end of the data packet is the inclined elevator, the metric value is used as the link metric result of the main link in the previous period within the current period. When the data packet is sent by a mobile terminal other than the inclined elevator, the third characteristic value of the main link in the previous period in the current period is used as the link measurement result of the main link in the previous period in the current period.

10. A safety wireless communication system for inclined elevators based on Internet technology, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the Internet-based safe wireless communication method for inclined elevators as described in any one of claims 1-9.

Images