CN114339783A - Cable channel wireless ad hoc network device and configuration method - Google Patents
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Abstract
The invention discloses a cable channel wireless ad hoc network device and a configuration method, comprising the following steps: a Mesh node; the Mesh auxiliary node is arranged at the bend of the cable channel, networking is matched between the Mesh auxiliary node and at least two Mesh nodes, and networking is matched between at least two Mesh auxiliary nodes arranged at continuous bends; and the Mesh node receives the signal strength of the Mesh auxiliary node to determine the distance between the Mesh node and the Mesh auxiliary node, and the configuration position of the Mesh auxiliary node is determined according to the distance. Aiming at the wireless ad hoc network device in complex underground closed space such as a curve, the concept of a Mesh auxiliary node is provided, and the anti-interference capability of the wireless ad hoc network device is improved by using the Mesh auxiliary node; and an accurate configuration method of the Mesh auxiliary node is provided, and the configuration accuracy is improved.
Description
Technical Field
The invention relates to the technical field of wireless ad hoc networks, in particular to a cable channel wireless ad hoc network device and a configuration method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, the wireless communication theory research in the channel mainly focuses on how to solve the multipath effect and how to solve the problem of electromagnetic wave signal attenuation at the bend. The influence of the curvature radius in the curved roadway on electromagnetic waves is researched, and the conclusion that the smaller the radius, the more serious the attenuation is, the higher the frequency is and the larger the attenuation rate is obtained; and software simulation calculation is utilized to obtain that the received signal strength is greatly influenced by the position change of the transmitting antenna, and the received signal strength is slightly larger when the transmitting antenna is close to the roadway wall than the transmitting antenna is at the central position of the roadway.
Because the electromagnetic wave can generate phenomena such as reflection, diffraction and the like when passing through the curved channel structure, the direct wave can be directly shielded by the channel wall, and simultaneously, besides each reflection, more rays which advance spirally are reflected from four walls, the electromagnetic wave propagation rays in the curved channel are more complicated than those in the linear channel, and the electromagnetic wave is reflected for more times, so that the propagation attenuation of the electromagnetic wave in the curved channel is much larger than that in the straight channel, and the problems of signal intensity weakening, signal connection loss and the like are caused.
The data transmission problem of the cable channel curve environment is solved, point-to-point remote communication cannot be realized, a dense networking mode is adopted, transmission nodes are increased, the transmission distance between two points is reduced, and communication transmission is carried out; however, the deployment and construction cost of the dense networking is very high, so that the dense networking is not suitable for being applied to a cable channel environment.
Disclosure of Invention
In order to solve the problems, the invention provides a cable channel wireless ad hoc network device and a configuration method, and provides a concept of a Mesh auxiliary node aiming at the wireless ad hoc network device in complex underground closed space such as a curve, and the Mesh auxiliary node is utilized to improve the anti-interference capability of the wireless ad hoc network device; and an accurate configuration method of the Mesh auxiliary node is provided, and the configuration accuracy is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a cable channel wireless ad hoc network device, including: a Mesh node; the Mesh auxiliary node is arranged at the bend of the cable channel, networking is matched between the Mesh auxiliary node and at least two Mesh nodes, and networking is matched between at least two Mesh auxiliary nodes arranged at continuous bends; and the Mesh node receives the signal strength of the Mesh auxiliary node to determine the distance between the Mesh node and the Mesh auxiliary node, and the configuration position of the Mesh auxiliary node is determined according to the distance.
As an alternative embodiment, the Mesh auxiliary node and the Mesh node are set to a regular wake-up mode, and data acquisition is performed regularly in a fixed period.
As an alternative implementation, the Mesh nodes within the wireless transmission power coverage range of the Mesh auxiliary node all communicate directly, and all the Mesh nodes are in equal positions.
In a second aspect, the present invention provides a method for configuring a wireless ad hoc network device using the cable channel, including:
determining a Mesh master node and a Mesh slave node for ranging according to the signal strength of the Mesh auxiliary node received by the Mesh node;
determining a mapping circle by taking the distance between the Mesh main node and the Mesh auxiliary node as a radius, wherein the Mesh auxiliary node is positioned on the mapping circle;
determining an optimal angle on the mapping circle according to the position coordinates of the Mesh master node and the Mesh slave node and the distance between the Mesh master node and the Mesh slave node;
and obtaining the configuration position coordinates of the Mesh auxiliary node according to the optimal angle.
As an alternative implementation, the distances between the Mesh master node and the Mesh slave node and the Mesh auxiliary node are obtained by adopting a cable channel model and a dynamic trilateration positioning algorithm according to the Mesh master node and the Mesh slave node.
As an alternative embodiment, the process of determining the distance to the Mesh auxiliary node includes:
wherein,
is the estimated value of the position of the arrangement, a is the actual position value, XσIs a gaussian distributed normal random variable; p (a) represents the signal power received by the Mesh node at Mesh secondary node a, p (a)0) Indicates the reference distance a0Where n represents the channel attenuation coefficient.
As an alternative implementation, the signal strengths of the Mesh auxiliary nodes are sorted according to the signal strength of the Mesh node, the Mesh node with the strongest received signal strength is selected as the Mesh master node, and the rest Mesh nodes are selected as the Mesh slave nodes.
As an alternative embodiment, the configuration position coordinate of the Mesh auxiliary node is obtained as (x) according to the optimal angle1+d1cosθ,y1+d1sin θ), wherein x1、y1As coordinates of the Mesh master node, d1And theta is the distance between the Mesh main node and the Mesh auxiliary node, and is the optimal angle.
As an alternative embodiment, in the configuration method, the method further includes: and screening the Mesh nodes which can receive the strongest signals of the Mesh auxiliary nodes at the edge of the wireless transmission power coverage range of the Mesh auxiliary nodes according to the probability distribution, thereby determining the initial positions of the Mesh auxiliary nodes.
As an alternative embodiment, in the configuration method, the method further includes: and after obtaining the configuration position coordinates of the Mesh auxiliary node, evaluating the error of the configuration position of the Mesh auxiliary node by adopting an average configuration error algorithm.
Compared with the prior art, the invention has the beneficial effects that:
the cable channel wireless ad hoc network device provided by the invention provides a concept of a Mesh auxiliary node aiming at a wireless ad hoc network device in a complex underground closed space such as a curve, and the anti-interference capability of the wireless ad hoc network device is improved by using the Mesh auxiliary node; meanwhile, the working modes of the Mesh auxiliary node and the Mesh node are set to be a regular wake-up mode, so that the power consumption is greatly reduced; by researching advanced wireless ad hoc network communication such as a low-power-consumption anti-interference data transmission technology and a communication ad hoc network technology and combining a complex environment in a cable channel, different types of sensing data aggregation and standardization of access nodes are realized, and a standard, rapid and reliable cable internet of things data wireless sensor network is formed.
The configuration method of the cable channel wireless ad hoc network device provided by the invention provides an accurate configuration mode of the Mesh auxiliary node aiming at the complex underground closed space such as a curve, has certain correction capability on the configuration position calculation method of the Mesh auxiliary node, reduces the influence of interference on configuration to a certain extent, and improves the configuration accuracy.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
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The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
Fig. 1 is a schematic view of a Mesh auxiliary node in a wireless ad hoc network device according to embodiment 1 of the present invention connected at a curve;
FIG. 2 is a graph comparing the power consumption of the present invention provided in embodiment 1 of the present invention with that of the prior art;
fig. 3 is a cable channel configuration diagram of a Mesh auxiliary node at a bend according to embodiment 2 of the present invention;
fig. 4 is a schematic diagram of coordinate calculation of a Mesh auxiliary node according to embodiment 2 of the present invention;
wherein: 1. a master node; 2. a slave node; 3. a slave node; 4. a Mesh auxiliary node; 5. and a control center.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that the terms "comprises" and "comprising", and any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1
The embodiment provides a cable channel wireless ad hoc network device, including: the system comprises a Mesh node arranged in an underground closed space, an intelligent sensor terminal wirelessly connected with the Mesh node, and a sensor connected with the intelligent sensor terminal and used for detecting the state of a cable; the Mesh nodes are networked by adopting a network topology structure of self-adaptive networking;
as shown in fig. 1, the wireless ad hoc network device further includes a Mesh auxiliary node 4 disposed at a bend of a cable channel; matching and networking between the Mesh auxiliary node 4 and at least two Mesh nodes; at least two Mesh auxiliary nodes 4 are arranged at the continuous curve, and the Mesh auxiliary nodes 4 are matched and networked; and receiving the signal strength of the Mesh auxiliary node through the Mesh node to determine the distance between the Mesh node and the Mesh auxiliary node, and determining the configuration position of the Mesh auxiliary node according to the distance.
Preferably, the Mesh auxiliary node 4 wirelessly communicates with a control center 5 on the ground, and the signal strength of the Mesh auxiliary node 4 is fed back to the control center 5.
Preferably, the Mesh auxiliary node 4 is a Mesh base station with a protection level IP68 and a communication distance of more than or equal to 200 meters, and Mesh nodes within a wireless transmission power coverage range can directly communicate.
In this embodiment, all Mesh nodes in the wireless ad hoc network device are in an equal status, and it is not necessary to specially arrange a central control node, a Mesh node has two functional roles of a host and a router, when the Mesh node is in a host state, a task of providing a required service for a user is executed, when the Mesh node is in a router state, a corresponding routing protocol is run, and the Mesh node participates in packet forwarding according to a routing policy, and a maintenance task needs to be executed on the route.
In this embodiment, the Mesh auxiliary node and the Mesh node are both set to be in a regular wake-up mode, and data fed back by the intelligent sensor terminal is regularly acquired in a fixed period;
preferably, when the intelligent sensor does not work, the Mesh auxiliary node and the Mesh node are in a standby mode, and each intelligent sensor terminal and each intelligent sensor are in a power-off state;
when the timing time is up, the Mesh auxiliary node and the Mesh node are automatically awakened, data are collected through the intelligent sensor terminal, the received data are stored in the storage unit to wait for sending, and the collection is finished;
after the data acquisition is completed, the data is uploaded to the control center 5, and then the standby mode is entered.
In the embodiment, through local control of the Mesh auxiliary node and the Mesh node, the Mesh auxiliary node and the Mesh node are in standby state when data are not acquired, so that the power consumption is reduced to the minimum; when the acquisition time in the period is reached, the Mesh auxiliary node and the Mesh node are automatically awakened, the power-on work is controlled locally, the acquired data is uploaded to a background, and then the power-off is controlled, so that the energy consumption is reduced; as can be seen from the power consumption comparison graph shown in fig. 2, the power consumption of the device of the present embodiment is always lower than that of the prior art over time;
after the early warning signal is monitored, the monitoring density in the period is automatically improved; the untimely monitoring caused by periodic monitoring is avoided; after the early warning signal disappears, the density is monitored in the automatic recovery period, and on the premise of not losing the monitoring effectiveness, the electric energy is saved.
In this embodiment, when the Mesh auxiliary node 4 is transmitted in a curve or a continuous curve, it is affected by the attenuation of an interference signal, and its channel model is:
p(a)(dBm)＝10lgp(a) (1)
wherein: p (a) represents the signal power received by the Mesh node at Mesh secondary node a, p (a)0) Indicates the reference distance a0And converting the received signal to decibel-milliwatts (dBm) for representation;
denotes an average received power, δ denotes a variance of a log-normal distribution, and n denotes a channel attenuation coefficient.
The Mesh auxiliary node jointly considers the influence of environmental interference and channel fading, and a reasonable Mesh auxiliary node path is established at a complex curve, so that network interference is reduced; and determining a channel distribution sequence according to the interference power load factor of each Mesh auxiliary node according to needs, and then selecting a channel with the minimum interference and channel load for each Mesh auxiliary node so as to further reduce network interference and improve network performance.
In this embodiment, the Mesh auxiliary node includes the following modules:
a data acquisition module: when system information is acquired in real time, various types of sensors are generally used, wherein the monitoring types include switching values, state quantities and analog quantities;
a data processing module: voltage related data are obtained through a microprocessor, active power and reactive power are calculated, analog quantity is processed, and command scheduling of switch on-off operation is completed;
a data transmission module: a wireless communication unit including low power consumption, short range;
a power supply module: the power supply system comprises a battery power supply unit and a power grid power supply unit.
In this embodiment, throughput generated by different hop counts is compared under single-frequency and dual-frequency networking conditions, and in a single-chain case, the throughput generated by adopting a single hop 50m is 5 times that generated by adopting a 3-hop 50m, and performance degradation is obvious, so that in Mesh networking, generally a single link preferably selects 3 hops, and at most, the single link does not exceed 5 hops.
Example 2
In this embodiment, a method for configuring a cable channel wireless ad hoc network device according to embodiment 1 is provided, which includes the following steps:
s1: according to the probability distribution, searching for a Mesh node which can receive the strongest signal of the Mesh auxiliary node at the edge of the coverage range of the Mesh auxiliary node, thereby determining the approximate position of the Mesh auxiliary node;
s2: receiving the signal strength of the Mesh auxiliary node through the Mesh node, selecting three Mesh nodes receiving the strongest signals of the Mesh auxiliary node, as shown in fig. 3, measuring the distance between the Mesh node and the Mesh auxiliary node in real time by adopting a dynamic trilateration configuration algorithm in combination with a channel model of a cable channel, and deducing the distance according to the channel model of the Mesh auxiliary node as follows:
wherein:
is the estimated value of the position of the arrangement, a is the actual position value, XσIs a Gaussian-distributed normal random variable, and represents that the configuration error increases along with the increase of the measurement distance;
s3: sorting the received signal strength in three Mesh nodes for ranging configuration, selecting the Mesh node with the strongest received signal strength as a master node 1, and using the other two Mesh nodes as a slave node 2 and a slave node 3;
as shown in fig. 4, a mapping circle is determined by taking the measured distance between the Mesh main node and the Mesh auxiliary node as a radius, and the Mesh auxiliary node 4 is on the mapping circle of the range of the main node 1;
obtaining the distance a between the Mesh auxiliary node and the Mesh node through the formula (4) according to the signals received by the master node 1, the slave node 2 and the slave node 31、a2And a3Searching an optimal angle theta on the mapping circle by using a dynamic trilateration algorithm, and finally obtaining the position coordinate of the Mesh auxiliary node;
the step S3 specifically includes:
s31: selecting the Mesh node receiving the strongest signal as the master node a1(x1,y1) Determining a mapping circle; measuring the distance d to the Mesh auxiliary node 41；
S32: determining position coordinates a of slave node 2 and slave node 32(x2,y2) And a3(x3,y3) Respectively measuring the distances d between the slave node 2 and the slave node 3 and the Mesh auxiliary node 42And d3；
S33: according to costDetermining an optimal angle theta by the minimum value of the function to obtain the configuration position coordinate of the Mesh auxiliary node 4: (x)1+d1cosθ,y1+d1sinθ)。
S4: and (3) evaluating the error E of the configuration position of the Mesh auxiliary node 4 by adopting an average configuration error algorithm:
wherein:
is the configuration position value of the ith Mesh auxiliary node, aiIs the actual position value of the ith Mesh auxiliary node, and R is the coverage range value of the Mesh auxiliary node.
The embodiment provides an accurate configuration mode of the Mesh auxiliary node aiming at complex underground closed spaces such as curves, has certain correction capability on a configuration position calculation method of the Mesh auxiliary node, reduces the influence of interference on configuration to a certain extent, improves the configuration accuracy, and can be widely applied to wireless ad hoc network occasions.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. Cable channel wireless ad hoc network device includes: a Mesh node; the cable channel is characterized by further comprising Mesh auxiliary nodes arranged at the bent positions of the cable channel, networking is matched between the Mesh auxiliary nodes and at least two Mesh nodes, and networking is matched between at least two Mesh auxiliary nodes arranged at continuous bent positions; and the Mesh node receives the signal strength of the Mesh auxiliary node to determine the distance between the Mesh node and the Mesh auxiliary node, and the configuration position of the Mesh auxiliary node is determined according to the distance.
2. The cable channel wireless ad hoc network device according to claim 1, wherein the Mesh auxiliary node and the Mesh node are set to a regular wake-up mode, and data collection is performed regularly in a fixed period.
3. The cable channel wireless ad hoc network device of claim 1, wherein the Mesh nodes within the wireless transmission power coverage of the Mesh auxiliary node all communicate directly, and all Mesh nodes are in equal status.
4. A method of configuring a wireless ad hoc network device using the cable channel of any one of claims 1-3, comprising:
determining a Mesh master node and a Mesh slave node for ranging according to the signal strength of the Mesh auxiliary node received by the Mesh node;
determining a mapping circle by taking the distance between the Mesh main node and the Mesh auxiliary node as a radius, wherein the Mesh auxiliary node is positioned on the mapping circle;
determining an optimal angle on the mapping circle according to the position coordinates of the Mesh master node and the Mesh slave node and the distance between the Mesh master node and the Mesh slave node;
and obtaining the configuration position coordinates of the Mesh auxiliary node according to the optimal angle.
5. The configuration method according to claim 4, wherein the distances between the Mesh master node and the Mesh slave node and the Mesh auxiliary node are obtained by using a cable channel model and a dynamic trilateration positioning algorithm according to the Mesh master node and the Mesh slave node.
6. The configuration method according to claim 5, wherein the process of determining the distance to the Mesh auxiliary node comprises:
wherein,
is the estimated value of the position of the arrangement, a is the actual position value, XσIs a gaussian distributed normal random variable; p (a) represents the signal power received by the Mesh node at Mesh secondary node a, p (a)0) Indicates the reference distance a0Where n represents the channel attenuation coefficient.
7. The configuration method according to claim 4, wherein the signal strengths are sorted according to the signal strength of the Mesh nodes receiving the Mesh auxiliary nodes, the Mesh node with the strongest received signal strength is selected as the Mesh master node, and the rest Mesh nodes are selected as the Mesh slave nodes.
8. The configuration method according to claim 4, wherein the configuration position coordinate of the Mesh auxiliary node obtained according to the optimal angle is (x)1+d1cosθ,y1+d1sin θ), wherein x1、y1As coordinates of the Mesh master node, d1And theta is the distance between the Mesh main node and the Mesh auxiliary node, and is the optimal angle.
9. The configuration method according to claim 4, wherein in the configuration method, further comprising: and screening the Mesh nodes which can receive the strongest signals of the Mesh auxiliary nodes at the edge of the wireless transmission power coverage range of the Mesh auxiliary nodes according to the probability distribution, thereby determining the initial positions of the Mesh auxiliary nodes.
10. The configuration method according to claim 4, wherein in the configuration method, further comprising: and after obtaining the configuration position coordinates of the Mesh auxiliary node, evaluating the error of the configuration position of the Mesh auxiliary node by adopting an average configuration error algorithm.
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