CN107018521B

CN107018521B - Networking method, device and system of wireless sensor network

Info

Publication number: CN107018521B
Application number: CN201710084557.1A
Authority: CN
Inventors: 何源; 郭俊辰; 郑霄龙
Original assignee: Tsinghua University
Current assignee: Tsinghua University
Priority date: 2017-02-16
Filing date: 2017-02-16
Publication date: 2020-06-23
Anticipated expiration: 2037-02-16
Also published as: CN107018521A

Abstract

The application discloses a networking method, a networking device and a networking system of a wireless sensor network, which are used for solving the problem that the coupling of an upper application and a bottom protocol stack of a WSN (wireless sensor network) in the prior art is stronger, wherein the wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; the method comprises the following steps: respectively determining role distribution parameters of each target wireless sensor node; and sending the role distribution parameters to the base station node so that the base station node can send the received role distribution parameters to the target wireless sensor nodes, so that the target wireless sensor nodes can receive the role distribution parameters, and the configurable attribute values of the target wireless sensor nodes are set according to the role distribution parameters to realize the functions corresponding to the role distribution parameters.

Description

Networking method, device and system of wireless sensor network

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a networking method, apparatus, and system for a wireless sensor network.

Background

Wireless Sensor Networks (WSNs) can be constructed by a large number of stationary or mobile Wireless Sensor nodes in a self-organizing and multi-hop manner. The WSN senses, collects and processes the information of the sensed object in the geographic area covered by the wireless sensor network in a cooperative mode, and finally sends the information to the network owner.

The numerous types of wireless sensors of the WSN can detect various physical quantities in the surrounding environment including earthquake, electromagnetism, temperature, humidity, noise, light intensity, pressure, soil composition, size, speed, direction of a moving object, and the like. Therefore, the wireless sensor network has wide application prospects in the application fields of military reconnaissance, environmental detection, industrial monitoring, activity perception, health care and the like.

In general, wireless sensor nodes of a WSN are scattered in an area that needs to be monitored and detected, and after deployment is completed, the wireless sensor nodes will self-organize a network, and determine whether to forward a received data packet according to a directional relationship between the nodes determined according to a network state. In the prior art, the upper application and the bottom protocol stack of the WSN have strong coupling, and when the performance of the upper application of the WSN is desired to be adjusted, developers are required to redevelop the bottom protocol stack of the WSN, which meets the performance requirement index value of the upper application, so that more human resources are consumed.

Disclosure of Invention

The embodiment of the application provides a networking method of a wireless sensor network, which is used for solving the problem that the coupling of an upper application and a bottom protocol stack of a WSN (wireless sensor network) in the prior art is strong.

The embodiment of the application also provides a networking device of the wireless sensor network, which is used for solving the problem that the coupling of an upper application and a bottom protocol stack of the WSN in the prior art is stronger.

The embodiment of the application also provides a networking system of the wireless sensor network, which is used for solving the problem that the coupling of an upper application and a bottom protocol stack of the WSN in the prior art is stronger.

The embodiment of the application adopts the following technical scheme:

a networking method of a wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable functions; the method comprises the following steps:

respectively determining role distribution parameters of each target wireless sensor node;

and sending the role distribution parameters to the base station nodes so that the base station nodes send the received role distribution parameters sent by the controller to the target wireless sensor nodes, so that the target wireless sensor nodes receive the role distribution parameters, and set the values of the configurable attributes of the target wireless sensor nodes according to the role distribution parameters to realize the functions corresponding to the role distribution parameters.

A networking method of a wireless sensor network comprises at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable functions; the method is applied to each target wireless sensor node and comprises the following steps:

receiving role distribution parameters sent by the base station node;

and setting the value of the configurable attribute of the target wireless sensor node according to the role distribution parameter, and realizing the function corresponding to the role distribution parameter.

A networking device of a wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable roles; the method comprises the following steps:

the determining unit is used for respectively determining role distribution parameters of the target wireless sensor nodes;

a sending unit, configured to send the role distribution parameter to the base station node, so that the base station node sends the received role distribution parameter sent by the controller to each target wireless sensor node, so that each target wireless sensor node receives the role distribution parameter, sets a value of a configurable attribute of the target wireless sensor node according to the role distribution parameter, and implements a function corresponding to the role distribution parameter.

A networking device of a wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable roles; the method is applied to each target wireless sensor node and comprises the following steps:

a receiving unit, configured to receive a role assignment parameter sent by the base station node;

and the function realization unit is used for setting the value of the configurable attribute of the target wireless sensor node according to the role distribution parameter and realizing the function corresponding to the role distribution parameter.

A networking system of a wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable roles;

the controller is used for respectively determining role distribution parameters of the target wireless sensor nodes;

sending the role assignment parameter to the base station node;

the base station node is used for sending the received role distribution parameters to each target wireless sensor node;

the target wireless sensor node is used for receiving the role distribution parameters;

The embodiment of the application adopts at least one technical scheme which can achieve the following beneficial effects:

when the performance of the upper application of the WSN is expected to be adjusted, firstly, role distribution parameters of each target wireless sensor node can be respectively determined, and then the role distribution parameters are sent to the base station node, so that the base station node can send the received role distribution parameters sent by the controller to each target wireless sensor node, and each target wireless sensor node can set the value of the configurable attribute of the target wireless sensor node according to the role distribution parameters, thereby realizing the function corresponding to the role distribution parameters, and further solving the problem that the coupling of the upper application of the WSN and a bottom protocol stack is strong in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1a is a schematic structural composition diagram of a wireless sensor network provided in embodiment 1 of the present application;

fig. 1b is a schematic view of an implementation flow of a networking method of a wireless sensor network provided in embodiment 1 of the present application;

fig. 1C is a schematic path diagram from any wireless sensor node C to a base station node in a wireless sensor network provided in embodiment 1 of the present application;

fig. 1d is a schematic diagram of determining a shortest path from a wireless sensor node C to a base station node according to embodiment 1 of the present application;

fig. 1e is a schematic structural diagram of a controller provided in embodiment 1 of the present application;

fig. 2 is a schematic flow chart illustrating an implementation process of a networking method of a wireless sensor network at a wireless sensor node end according to embodiment 1 of the present application;

fig. 3 is a schematic structural diagram of a networking device of a wireless sensor network according to embodiment 2 of the present application;

fig. 4 is a schematic structural diagram of a networking device of a wireless sensor network according to embodiment 3 of the present application;

fig. 5 is a schematic structural diagram of a networking system of a wireless sensor network according to embodiment 4 of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The technical solutions provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Example 1

In order to solve the problem of strong coupling between an upper application and a bottom protocol stack of a WSN in the prior art, an embodiment of the present application provides a networking method for a wireless sensor network, as shown in fig. 1a, the wireless sensor network includes a controller, at least one base station node, and at least one wireless sensor node, where the at least one wireless sensor node includes at least one target wireless sensor node.

The execution subject of the networking method of the wireless sensor network provided by the embodiment of the application can be a controller in the wireless sensor network, and can also be any device for realizing the method provided by the application in the wireless sensor network. First, in the embodiment of the present application, an execution subject of the method is taken as an example of a controller, and a detailed description is given to an implementation manner of the method, as shown in fig. 1b, which is a schematic diagram of an implementation flow of the method, and includes the following steps:

step 11, respectively determining role distribution parameters of each target wireless sensor node;

the role distribution parameters refer to parameters which are determined by the controller according to the network state of the wireless sensor network and the upper-layer application requirements and represent the functions of each target wireless sensor node, and each target wireless sensor node can determine the function of the target wireless sensor node according to the role distribution parameters, namely each target wireless sensor node can determine which acquired modal data can be sent by the target wireless sensor node according to the role distribution parameters and forward which modal data sent by the neighbor nodes.

In order to solve the problem that the coupling between an upper application and a bottom protocol stack of a WSN in the prior art is strong, the method and the device for determining the role assignment parameters of the target wireless sensor nodes can respectively determine information representing the role assignment parameters of the target wireless sensor nodes, and then respectively determine the role assignment parameters of the target wireless sensor nodes according to the information. To meet the requirements of the upper layer application, the information may include at least one of the following: network state information of the wireless sensor network; modal information of the wireless sensor network; and inputting information of the controller, which is used for representing the role assignment parameters of each target wireless sensor node, by a user.

The determination process of the network state information comprises the following steps:

(1) firstly, receiving a sensing data packet sent by a wireless sensor node, wherein the sensing data packet comprises expected retransmission times and a network topology adjacency list;

(2) then, analyzing the sensing data packet;

(3) and finally, determining the network state information according to the analyzed expected retransmission times and the network topology adjacency list.

In order to avoid the situation that when the wireless sensor network is in a Duty Cycle (English name: Duty Cycle) working mode, some wireless sensor nodes in the wireless sensor network are possibly in a dormant state, and the determined network state information of the wireless sensor network is incomplete, when the network state information is the whole network state information of the wireless sensor network, the whole network state information of the wireless sensor network is determined according to received sensing data packets sent by part of the wireless sensor nodes in the wireless sensor network.

The sensing data packet comprises the network state information of the wireless sensor node and the network state information of the neighbor nodes of the wireless sensor node, so that the overall network state information of the wireless sensor network can be determined according to the network state information of each node in part of the wireless sensor nodes and the network state information of the neighbor nodes of each node. The specific process for determining the network state information of the whole wireless sensor network will be described in detail later.

After the network state information of the whole wireless sensor network is determined, the role allocation parameters of each wireless sensor node can be determined according to the performance requirement index value of the upper application of the WSN, the determined network state information and the determined mode information of the whole wireless sensor network.

The upper application of the WSN refers to an application program on the upper layer of the WSN. The upper application of the WSN can run in the computing equipment and has the capability of acquiring data collected by wireless sensor nodes in the WSN and executing predetermined operation according to the data. Different applications often have different requirements for data collected by wireless sensor nodes in the WSN. If an application program for carrying out statistical analysis on the temperature needs temperature data acquired by the wireless sensor node; and the application program for clipping the video needs the video image acquired by the wireless sensor node.

The underlying protocol stack of the WSN refers to the sum of the protocols of the layers that are followed for communication between nodes in the WSN. In WSN, the underlying protocol stack needs to match the performance requirement index value of the upper layer application. The performance requirement index value of the upper layer application of the WSN refers to a parameter value used for representing the performance requirement of the upper layer application, such as but not limited to a value including a delay amount required by the upper layer application, a value of throughput, a value of network lifetime, a packet loss rate, and the like. The performance requirement index value of the upper layer application is changed (namely the performance of the upper layer application of the WSN is adjusted), and the change of the performance requirement index value can be realized by changing the roles of at least part of nodes in the WSN. According to the prior art, the role of the node is changed, and the change can be realized only by changing the underlying protocol stack of the WSN, for example, a plurality of index selection methods or calculation methods used by the protocol are redefined. In this way, technicians are required to manually re-develop or modify codes set in the wireless sensor nodes, which consumes more human resources.

According to the method provided by the embodiment of the application, the role allocation parameters of each wireless sensor node can be determined according to the performance requirement index value of the upper application and the determined network state information and mode information of the whole wireless sensor network, so that the problem that more human resources are consumed when the performance of the upper application is expected to be adjusted can be solved.

After determining the role assignment parameters for each target wireless sensor node, the role assignment parameters may be sent to the base station node by performing step 12.

And step 12, sending the role distribution parameters of the target wireless sensor nodes to the base station node, so that the base station node sends the received role distribution parameters sent by the controller to the target wireless sensor nodes, so that the target wireless sensor nodes receive the role distribution parameters, and set the values of the configurable attributes of the target wireless sensor nodes according to the role distribution parameters to realize the functions corresponding to the role distribution parameters.

Specifically, in order to facilitate data transmission between the controller and the base station node, first, the controller may construct a first data packet including role assignment parameters of each target wireless sensor according to the role assignment parameters; and then sending the first data packet to the base station node so that the base station node generates a corresponding role distribution data packet according to the first data packet, and then sending the role distribution data packet to each target wireless sensor node, wherein the role distribution data packet comprises role distribution parameters of the target wireless sensor.

It should be noted that, the specific implementation process of step 11 may include:

step 11-1, determining the network state of the wireless sensor network and the sending mode of each wireless sensor node;

in this embodiment of the present application, the network state includes a directional connection relationship between wireless sensor nodes in a wireless sensor network, as shown in fig. 1c, which is a schematic view of a directional connection relationship between wireless sensor nodes in a wireless sensor network provided in this embodiment of the present application, and a controller may determine the network state of the wireless sensor network through a data packet containing sensing data sent by each wireless sensor node, that is, a network state contained in a sensing data packet described later, where a specific determination process may be described in detail later.

The sending mode of each wireless sensor node can be set by a user through the controller according to the requirements of upper-layer applications, for example, when the user wants to acquire data of a certain specific mode as soon as possible, the sending mode of each wireless sensor node can be designated as the specific mode through the controller, that is, the controller can determine the sending mode of each wireless sensor node according to the preconfigured information representing the sending mode, and the information representing the sending mode can be configured by the user through the controller.

After the controller determines the network state of the wireless sensor network and the transmission modality of each wireless sensor node, the role assignment parameters of each wireless sensor node can be determined by executing step 11-2, so that each wireless sensor node determines its own function according to the role assignment parameters.

And 11-2, determining role distribution parameters of each wireless sensor node according to the network state and the sending mode determined in the step 11-1, so that each wireless sensor node determines the function of the wireless sensor node according to the role distribution parameters.

The controller can determine the forwarding mode of each wireless sensor node according to the network state of the wireless sensor network and the sending mode of each wireless sensor node, and then determine the role distribution parameters according to the sending mode and the forwarding mode of each wireless sensor node. The forwarding modes include a mode in which each wireless sensor node supports forwarded data, that is, a mode in which each wireless sensor node can forward data after receiving a data packet sent by a neighboring node of the wireless sensor node.

Specifically, the controller determines the forwarding mode of each wireless sensor node, which may be implemented in the following two ways:

first, according to a network state, determining a first set formed by wireless sensor nodes included in a path from a first wireless sensor node to a base station node, where the path refers to a communication link, and then the wireless sensor nodes in the first set are the wireless sensor nodes through which the first wireless sensor node transmits data to the base station node; secondly, adding the sending mode of the first wireless sensor node into the forwarding mode of the second wireless sensor node, so as to determine the forwarding mode of the second wireless sensor node. The first wireless sensor node is any wireless sensor node in a wireless sensor network, and the second wireless sensor node is any wireless sensor node in a first set.

As shown in fig. 1C, for any wireless sensor node C in the wireless sensor network, the controller first determines a set { U } of wireless sensor nodes included in a path from the wireless sensor node C to the base station node BS according to the network state, and from fig. 1C, it may determine that A, B, D and I are included in the set { U }; for any wireless sensor node belonging to the set { U }, such as node B, the transmission modality s (C) of the wireless sensor node C may be added to the forwarding modality of the wireless sensor node B, and for the set { U }, the transmission modality s (C) of the wireless sensor node C may be added to the forwarding modalities of the wireless sensor nodes A, B, D and I, respectively, and the wireless sensor nodes A, B, D and I will forward the data with the transmission modality s (C) when receiving the data, so that the data packet can be received by the base station node.

In addition, when it is determined that a certain wireless sensor node does not belong to the determined set through the network state, it may be determined that the forwarding mode of the wireless sensor node is null, that is, the wireless sensor node may not forward the received data packet of the neighboring node, so that unnecessary forwarding of the received data packet by some nodes when the wireless sensor network transmits the data packet containing sensing data may be effectively avoided.

In the second mode, firstly, the controller determines a child node of a third wireless sensor node in the wireless sensor network, and adds a transmission mode and/or a forwarding mode of the child node to the forwarding mode of the third wireless sensor node, so that the forwarding mode of the second wireless sensor node can be determined. For example, when the forwarding mode of the child node is null, that is, the child node does not forward data of any mode, the sending mode of the child node is added to the forwarding mode of the third wireless sensor node; and adding the sending mode and the forwarding mode of the child node into the forwarding mode of the third wireless sensor node when the forwarding mode of the child node is not empty.

Wherein the controller may determine the child node of the third wireless sensor node by:

step i, firstly, a controller can determine a first hop count from a third wireless sensor node to a base station node in a wireless sensor network and a second hop count from a neighbor node of the third wireless sensor node to the base station node according to a network state, wherein the first hop count is the shortest hop count from the third wireless sensor node to the base station node, and the second hop count is the shortest hop count from the neighbor node of the third wireless sensor node to the base station node;

and step ii, when the first hop count is determined to be smaller than the second hop count, determining the neighbor node of the third wireless sensor node as a child node of the third wireless sensor node.

Since each wireless sensor node in the wireless sensor network is an ad hoc network in the prior art, a network formed after each wireless sensor node is ad hoc network may have a ring network, as shown in fig. 1c, there are two paths from node D to the base station node: in the embodiment of the application, the shortest hop count from the sensor node D to the base station node can be determined according to the determined network state, and then the path with the shortest hop count is selected for data transmission when the data transmission is carried out, so that the network delay of the data transmission in the wireless sensor network can be minimized.

In this embodiment of the application, the shortest hop count from the sensor node to the base station node may be determined according to the determined network state, and specifically, the controller may determine, according to the determined network state, a child node set of the wireless sensor node and the shortest hop count to the base station node by using the base station node as a root node. As shown in fig. 1d, the method for determining the shortest hop count may include the following three steps: starting from a base station node BS, after accessing the base station node BS, sequentially searching each non-accessed adjacent point A, E and I of the accessed BS; secondly, sequentially searching and accessing each non-accessed adjacent point F of each non-accessed adjacent point B, E of the A, and each non-accessed adjacent point D of each non-accessed adjacent point G, I of the A; and thirdly, sequentially accessing each non-accessed adjacent point C of B and each non-accessed adjacent point H of G. In this way, a spanning tree T with the shortest hop count can be constructed, and the spanning tree T includes each wireless sensor node in the wireless sensor network and a set of edges formed by each wireless sensor node.

Since the shortest hop count determination method can make the paths between other nodes except the root node in the constructed spanning tree and the root node be the shortest paths, the network delay in the wireless sensor network can be minimized. The shortest hop count determination method can also be realized by a breadth-first search algorithm.

If the shortest hop count from the wireless sensor node u to the base station node is determined to be 1 more than the shortest hop count from the wireless sensor node v to the base station node, that is, hop (u) -hop (v) -1, when the edge e (v, u) is not an edge included in T, it may be determined that the set of child nodes of the wireless sensor node v is child (v) -child (v) ∪ { u }, that is, the wireless sensor node u is a child node of the wireless sensor node v, and if the shortest hop count from the wireless sensor node u to the base station node is determined to be 1 less than the shortest hop count from the wireless sensor node v to the base station node, that is, hop (v) -hop (u) -1, it may be determined that the set of child nodes of the wireless sensor node u is child (u) ∪ { v }, that the wireless sensor node v is a child node of the wireless sensor node u.

After determining the subset of each wireless sensor node, if determining that the subset child (v) of the wireless sensor node v is an empty set, determining that the forwarding mode f (v) of the wireless sensor node v is empty, that is, the wireless sensor node v does not forward data of any mode; if it is determined that the child node set child (v) of the wireless sensor node v is not an empty set, the transmission mode and the forwarding mode of each wireless sensor node included in the child node set child (v) may be added to the forwarding mode of the wireless sensor node v.

After the controller determines the forwarding modalities of the wireless sensor nodes, if it is determined that the transmission modality of the wireless sensor node v is s (v) and the forwarding modality is f (v), it may be determined that the role assignment parameter of the wireless sensor node v is role (v) (s (v)) ∪ f (v), that is, the wireless sensor node may transmit a data packet whose own generated data modality is s (v) to its neighboring node, or may transmit a data packet whose received data modality transmitted by the neighboring node of the wireless sensor node v belongs to f (v) to its neighboring node.

The method provided by the application can be applied to a software-defined wireless sensor network, the software-defined wireless sensor network comprises a controller, a base station node and at least one wireless sensor node, the controller can send the role distribution parameter to the base station node after determining the role distribution parameter of each wireless sensor node, and the base station node sends the role distribution parameter to a neighbor node after receiving the role distribution parameter, so that each wireless sensor node can determine the own role according to the role distribution parameter.

In the following, how to determine the overall network status of the wireless sensor network will be described in detail, including the following steps:

step I, a controller determines the network state of partial wireless sensor nodes in the wireless sensor network according to received sensing data packets, wherein the sensing data packets are respectively sent by the partial wireless sensor nodes, and the sensing data packets comprise network state values used for representing the network state of the wireless sensor nodes and the network state of neighbor nodes of the wireless sensor nodes;

because the time of each wireless sensor node is often asynchronous, in the prior art, if a high overhead is required for time synchronization of each wireless sensor node in the wireless sensor network, and the network state of some wireless sensor nodes may be lost due to loss of sensing data packets, the network state of some wireless sensor nodes received by the controller in the embodiment of the present application is asynchronous.

When the network state of the wireless sensor node is determined to be asynchronous, determining the network state of each wireless sensor node according to the received sensing data packet sent by the base station node may include:

①, firstly, according to the received sensing data packet sent by the base station node, determining the network state value which represents the network state in the sensing data packet;

② then, based on the network state values in ①, an n × n matrix M is constructed, where M is expressed as:

wherein n is wireless in the wireless sensor networkThe number of the sensor nodes is equal to or greater than the number of the sensor nodes,

m_ij∈M，m_ijis the network state value of the node j acquired by the wireless sensor node i from the wireless sensor node j, and when i is equal to j, m is_ijIs the network state value, M, of the wireless sensor node i itself₁＝[m₁₁…m_1j…m_1n]，M_i＝[m_i1…m_ij…m_in]，…，M_n＝[m_n1…m_nj…m_nn]。

In order to avoid that the acquired network states of the wireless sensor nodes are incomplete and asynchronous, step II needs to be performed to infer the network states of the wireless sensor nodes determined by the controller, so as to achieve the integrity and synchronization of the network states of the wireless sensor nodes in the wireless sensor network represented by the matrix M.

And step II, the controller determines the network state of each wireless sensor node in the wireless sensor network according to the network state of part of the wireless sensor nodes.

Specifically, when the controller receives a sensing data packet from the wireless sensor node i, a 1 × n matrix R containing network state values is determined according to the sensing data packet of the wireless sensor node i_i；

Wherein, i ∈ [1, n]，R_i＝[r₁…r_k…r_n]，

NB_iIs a neighbor node of i, EDC_kIs the network status value of the wireless sensor node k.

When determining the matrix R_iRelative to M in the matrix M_iWhen the network state value is newly generated, M in the matrix M is used_iIs replaced by R_i。

In particular, the matrix R_iContaining the sequence number q_rcvAnd ith row M of matrix M_iContaining the sequence number q_lastWhen q is greater_rcv>q_lastThen, it indicates the matrix R_iRelative to M in the matrix M_iThe controller will send M the newly generated network status value_iIs replaced by R_i。

M in M_iIs replaced by R_iThen, due to the matrix R_iThe network state values of the wireless sensor node i and the neighbor nodes thereof are included, so that the newly generated network state values can be determined by comparing the reference time of the neighbor nodes of the wireless sensor node i with the reference time of the corresponding wireless sensor node in the matrix M.

First, the controller is according to expression t_ref(i)＝t_update(i)-EDC_i×T_nodeDetermining to generate m_iiReference time t of the sensing data packet_ref(i) According to the expression t_ref(w)＝t_update(w)-EDC_w×T_nodeDetermining generation of each neighbor node of wireless sensor node i to contain r_wReference time t of the sensing data packet_ref(w)，w∈NB_i；

Then, when the controller determines t_ref(i) Greater than t_refWhen (w), m is_wwIs replaced by r_w；

Wherein, t_update(i) Is the time when the sensing data packet sent by the wireless sensor node i is received, t_update(w) is the time when the sensing data packet sent by the wireless sensor node w is received, T_nodeIndicating the duty cycle, EDC, of a wireless sensor node_iIs the network status value, EDC, of the wireless sensor node i_wIs the network state value of the wireless sensor node w. When m is_wwIs replaced by r_wThen, m is indicated_wwIs updated by the sensing data packet generated by the wireless sensor node i, and thus, the updated m_wwIs t_ref(w)＝t_update(i)-EDC_i×T_node。

In determining each in wireless sensor networkAfter the network state value of the wireless sensor node is determined, namely after the matrix M is determined, if M is_ij>0, the wireless sensor node i is a neighbor node of the wireless sensor node j, and when m is_ii>m_jjWhen the wireless sensor node i and the wireless sensor node j form a directed connection relation, the direction is from the wireless sensor node i to the wireless sensor node j, and if m is m, the directional connection relation is formed_ijAnd if the number is less than or equal to 0, the wireless sensor node i is not the neighbor node of the wireless sensor node j.

Each wireless sensor node can send a sensing data packet to the base station node, wherein the sensing data packet comprises a network state value used for representing the network state of the wireless sensor node and the network state of the neighbor nodes of the wireless sensor node, and the base station node can send the sensing data packet to the controller after receiving the sensing data packet sent by part or all of the wireless sensor nodes, so that the controller can determine the network state of each wireless sensor node according to the received network state contained in the sensing data packet sent by the base station node, and the whole network state of the wireless sensor network can be determined.

The processing of the wireless sensor node in the determination of the overall network state of the wireless sensor network comprises the following steps: and sending a sensing data packet to the base station node, wherein the sensing data packet comprises network state values used for representing the network states of the wireless sensor node and the neighbor nodes of the wireless sensor node, so that a controller in the wireless sensor network can determine the network state of each wireless sensor node in the wireless sensor network according to the network states of part of the wireless sensor nodes in the wireless sensor network.

The method for sending the sensing data packet to the base station node for any wireless sensor node i in the wireless sensor network specifically includes:

according to a determined reporting period T_mSending a sensing data packet to a base station node, wherein the report period T_mIs determined according to the network states of the wireless sensor node and the neighbor nodes thereof, and reports a period T_mRefers to the time when the wireless sensor node i sends the sensing data packet for the mth time and the (m-1) th timeAn interval, wherein m is an integer greater than 1.

It should be noted that, because the network state of each wireless sensor node in the wireless sensor network greatly floats during the startup phase of the wireless sensor network, in order to facilitate the controller to quickly determine the network state of each wireless sensor node during the startup phase, the time interval T between the 2 nd time and the 1 st time of sending the sensing data packet of the wireless sensor node i₁For a preset minimum reporting period T_min。

After the wireless sensor node i sends the sensing data packet for the 2 nd time, the time interval T between the m +1 th time and the m-th time of sending the sensing data packet_mIs determined by the following method:

(1) firstly, after a wireless sensor node i sends a sensing data packet for the mth time, a fluctuation parameter is determined according to network states of the wireless sensor node i and neighbor nodes thereof contained in the sensing data packet sent by the wireless sensor node i this time.

(2) Then, if it is determined that the fluctuation parameter determined at the mth time is the same as the fluctuation parameter determined at the m-1 st time, T is determined_m-1+Δt≤T_maxThen determine T_mIs T_m-1+ Δ T, where Δ T is a preset time increment, T_maxIs a preset maximum reporting period. When the determined fluctuation parameter of the mth time is the same as the determined fluctuation parameter of the (m-1) th time, the network state of the wireless sensor node i is indicated to be in a stable state, and in order to reduce the pressure of the controller for processing data, T can be increased_m。

(3) Finally, if the fluctuation parameter determined in the mth time is different from the fluctuation parameter determined in the m-1 th time, T is judged_m-1*a≥T_minThen determine T_mIs T_m-1A, wherein a is a preset factor and 0<a<1. When the determined fluctuation parameter of the mth time is the same as the determined fluctuation parameter of the m-1 th time, the network state of the wireless sensor node i is in an unstable state, and the controller can conveniently acquire the changed network state in time, so that T can be reduced_m。

In the embodiment of the present application, determining a fluctuation parameter according to network states of a wireless sensor node i and neighboring nodes thereof included in a sensing data packet sent by the wireless sensor node i this time specifically includes the following two steps:

step a, determining a network state value EDC representing the network state of the wireless sensor node i from a sensing data packet sent by the wireless sensor node i this time_iAnd length of its neighbor list | NB_iAnd the network state value of the network state of its neighbor node.

Step b, according to the expression

Determining a fluctuation parameter f_iWherein, | NB_iI is the length of the neighbor list of the wireless sensor node i, NB_i(t) is the t-th neighbor, EDC, of the wireless sensor node i_iIs the network status value of the wireless sensor node i,

is the network state value of the t-th neighbor node of the wireless sensor node i,

The above details describe the processing performed by the controller side in the networking method of the wireless sensor network, and the following details describe a specific implementation process of the networking method of the wireless sensor network from the wireless sensor node side, as shown in fig. 2, a schematic flow diagram of an implementation process of the networking method of the wireless sensor network at the wireless sensor node end provided in the embodiment of the present application includes the following steps:

step 21, receiving role distribution parameters sent by a base station node;

specifically, the role distribution data packet is received first, and then when it is determined that the node realizes the function of forwarding the role distribution data packet, the received role distribution data packet is forwarded to the neighbor node of the node.

Each wireless sensor node has at least two configurable functions, and may include a sending function and a forwarding function, where the sending function refers to a function of sending a data packet containing certain modality of sensing data after each wireless sensor node collects sensing data, and the forwarding function refers to a function of forwarding the data packet after the wireless sensor node receives the data packet containing certain modality of sensing data sent by its neighboring node.

Each wireless sensor node may or may not have a forwarding function. When the wireless sensor node has a forwarding function, it indicates that the wireless sensor node can forward a data packet containing sensing data of a certain modality, which is sent by a neighboring node of the wireless sensor node, and at this time, it is determined that the wireless sensor node realizes a function of forwarding a role distribution data packet. And when the wireless sensor node does not have the forwarding function, the wireless sensor node indicates that the wireless sensor node does not perform forwarding operation on the data packet containing the sensing data sent by the neighbor node, and at the moment, the wireless sensor node is determined not to realize the function of forwarding the role distribution data packet.

When the wireless sensor node realizes the function of forwarding the role distribution data packet, the received role distribution data packet is forwarded to the neighbor node, and when the wireless sensor node does not realize the function of forwarding the role distribution data packet, the forwarding operation is not performed, so that the wireless sensor node without the function of forwarding the role distribution data packet can be prevented from performing unnecessary forwarding operation on the received data packet.

In order to facilitate that, after receiving the role distribution data packet, each target wireless sensor node can determine its role distribution parameter according to its own identifier, and the role distribution data packet may further include the identifier of each target wireless sensor node and a one-to-one correspondence relationship between the role distribution parameters of each target wireless sensor node, step 21 may include the following processes:

(1) receiving a role distribution data packet;

(2) and determining the role distribution parameters corresponding to the identifiers of the wireless sensor nodes according to the corresponding relation between the identifiers of the target wireless sensors in the role distribution data packet and the role distribution parameters.

After receiving the role assignment parameters sent by the base station node, each target wireless sensor node may implement the function corresponding to the role assignment parameters by executing step 22.

And step 22, setting the value of the configurable attribute of the node according to the role distribution parameter, and realizing the function corresponding to the role distribution parameter.

The value of the configurable attribute refers to a value that can be set by each wireless sensor node according to the role distribution parameter, so as to realize a function corresponding to the role distribution parameter. For example, the node may be a value representing that the wireless sensor node implements sending of data of a certain modality acquired by the node, or a value representing that the wireless sensor node implements forwarding of data of a certain modality received by the node to a neighboring node.

And after determining the role distribution parameters corresponding to the wireless sensor nodes, the wireless sensor nodes realize the functions corresponding to the determined role distribution parameters.

Due to the fact that the wireless sensor network is in the Duty Cycle working mode and the unreliability of the wireless link, some wireless sensor nodes may miss the role distribution data packet sent in the above steps due to dormancy or the unreliability of the wireless link, and the like, and therefore functions between two adjacent wireless sensor nodes may not be distributed in the same role distribution process. Therefore, the role distribution data packet may include a first version number, where the first version number is used to distinguish role distribution parameters sent by the controller each time, after each wireless sensor node receives the role distribution data packet, the first version number is first added to a second data packet to be sent, where the second data packet may be any data packet to be sent by the wireless sensor node, for example, a data packet including sensing data, and thus, after receiving any data packet sent by a neighboring node, the wireless sensor node may determine whether to update its own function. The process that the wireless sensor node judges whether the self function needs to be updated according to the data packet sent by the neighbor node comprises the following steps:

after a third data packet sent by a first neighbor node is received, determining a second version number which is contained in the third data packet and used for distinguishing role distribution parameters sent by a controller each time;

the third data packet may be any data packet transmitted by the first neighboring node, such as the data packet containing the sensing data described above.

Specifically, the version number is a unique identifier of the role assignment precedence order, namely a unique identifier of new and old roles. The version number may be a version number generated and maintained by the controller, with later-in-production-time role assignments typically having a greater value than earlier-in-production-time role assignments. The controller may simultaneously transmit the version number of the role assignment when transmitting the first packet to the base station node. When encapsulating the packet with the transmission role, the base station node places the version number in the header field of the data packet. Each wireless sensor node itself may maintain a highest version number, referred to as a node version number, assigned to its local role. The node judges whether the version is new or old by comparing the relationship between the version number of the node and the size of the version number in the received data packet, namely, the larger the version number in a certain data packet is, the newer the role distribution is.

Step two, comparing the version of the self function of the node with the old and new version of the function of the first neighbor node according to the first version number and the second version number;

the embodiment of the application provides an optional implementation manner, and if the controller maintains version number distribution by using increment as 1 each time, the version number field with the bit length of L can only represent 0-2 ^ L-1 and has 2^ L version numbers, namely, a special case that the version numbers are used up exists. At this time, in order to avoid errors in the version number judgment process, a method of cyclic use may be adopted, and if the controller determines that the version number has been used to 2^ L-1 in an increasing manner, i.e., the maximum value, the next version number is cycled to 0 and continues to be increased. Then, when the new-old relationship between the version number a of the wireless sensor node and the version number b carried by a certain data packet is compared, the following judgment can be made: for a > b, if a-b < 2^ (L-1) is determined, the version number a can be determined to be newer than b, otherwise, the version number a is older than b; for a ═ b, consider a consistent with version b; for a < b, if b-a < 2^ (L-1), version number a is older than b, otherwise version number a is newer than b.

When the version of the own function of the node is an old version relative to the version of the function of the neighbor node, the node sends a data packet containing role distribution requesting the new version to the neighbor node, and after the neighbor node receives the data packet, the node sends a role distribution data packet corresponding to the own function to the node, so that the node realizes the function corresponding to the role distribution data packet according to the role distribution parameters contained in the received role distribution data packet. And when the version of the self function of the node is a new version relative to the version of the function of the neighbor node, executing the step three.

And step three, when the version of the self function of the node is a new version relative to the version of the function of the first neighbor node, sending the role distribution data packet corresponding to the version of the self function of the node to the first neighbor node, so that the first neighbor node realizes the function corresponding to the role distribution data packet according to the role distribution parameters contained in the role distribution data packet.

And step four, when the version of the self function of the wireless sensor node is an old version relative to the version of the function of the first neighbor node, the wireless sensor node firstly requests the first neighbor node to send a role distribution data packet corresponding to the version of the function of the first neighbor node to the wireless sensor node, and then the function corresponding to the role distribution data packet is realized according to role distribution parameters contained in the role distribution data packet sent by the first neighbor node.

Specifically, when the wireless sensor node determines that the version of its own function is an old version relative to the version of its neighbor node function, the wireless sensor node sends a request packet to its neighbor node for requesting the role assignment of the latest version, and the version number included in the packet header of the request packet is the version number of the role assignment that the node wishes to request.

In order to avoid that the wireless sensor node sends a large number of request data packets to its neighbor and causes information redundancy when determining that its version is an old version relative to the version of its neighbor node function, an optional implementation manner is provided in the embodiments of the present application, where when receiving a request data packet, the neighbor node of the wireless sensor node replies an acknowledgement data packet for indicating that the neighbor node of the wireless sensor node receives the request data packet, and immediately sends a role of this version to assign to the wireless sensor node. The confirmation data packet is used for blocking the wireless sensor node from continuously sending the request data packet to the neighbor node, so that redundant information caused by excessive neighbor node replies can be avoided.

In addition, in the embodiment of the present application, when the wireless sensor node determines that the version of its own function is inconsistent with the version of its neighboring node function, and the wireless sensor node and its neighboring node are both in a data transmission path, due to the inconsistency of the version numbers of the wireless sensor node and its neighboring node, a packet loss phenomenon may occur in a transmission process of a data packet.

In order to solve the above problem, an omni-directional mode concept is introduced in the embodiments of the present application, where the omni-directional mode refers to a special mode in which any wireless sensor node receives a data packet marked with the omni-directional mode and can forward the data packet. That is, when the version of the function of the wireless sensor node is a new version relative to the version of the function of the neighboring node, the omni-directional modal identifier is added to the received third data packet sent by the neighboring node, so that the wireless sensor node receiving the third data packet forwards the third data packet according to the omni-directional modal identifier.

In addition, the specific implementation process of each wireless sensor node in the wireless sensor network in data transmission may include the following steps:

step A, receiving a first sensing data packet sent by a second neighbor node, wherein the first sensing data packet comprises sensing data acquired by the second neighbor node and a network state of the second neighbor node;

step B, determining the mode of perception data according to the received first perception data packet;

step C, judging whether the node realizes the function of forwarding the data of the mode and whether the network state of the second neighbor node meets the forwarding condition;

step D, if the node is determined to realize the function of forwarding the modal data and the network state of the second neighbor node meets the forwarding condition, forwarding the received sensing data packet;

and E, if the node is determined not to realize the function of forwarding the data of the mode and/or the network state of the second neighbor node does not meet the forwarding condition, discarding the received sensing data packet.

It should be noted that, as shown in fig. 1e, a schematic structural diagram of a controller provided in embodiment 1 of the present application is provided, where the controller includes: the system comprises a southbound communication module, a network topology management module, a role generation module and a northbound user interface module.

The southward communication module is used for analyzing and assembling serial port data packets communicated with the base station node, namely a first data packet, and the module is realized on the basis of a serial port communication interface packaged by an operating system corresponding to the wireless sensor node.

And the network topology management module is used for integrating the network states of the neighbor nodes contained in the sensing data packet and providing an inquiry interface of the integral network state information of the wireless sensor network for the upper-layer application of the WSN.

And the role generation module is used for determining role distribution parameters of each target wireless sensor node.

And the northbound user interface module is used for providing network state information of the packaged wireless sensor network for users, such as connectivity, expected retransmission times of the wireless sensor nodes and the like, and role allocation parameter setting interfaces of all target wireless sensor nodes.

Example 2

Based on the same inventive concept as that in embodiment 1, an embodiment of the present application provides a networking device for a wireless sensor network, which is used to solve the problem that in the prior art, the upper layer application and the bottom layer protocol stack of a wireless sensor node have strong coupling.

As shown in fig. 3, for the networking device of the wireless sensor network provided in embodiment 2 of the present application, the wireless sensor network includes a controller, at least one base station node, and at least one wireless sensor node, where at least one of the at least one wireless sensor node includes at least one target wireless sensor node, and each target wireless sensor node has at least two configurable functions, and includes the following functional units:

a determining unit 31, configured to determine role assignment parameters of each target wireless sensor node respectively;

a sending unit 32, configured to send the role assignment parameter to the base station node, so that the base station node sends the received role assignment parameter sent by the controller to each target wireless sensor node, so that each target wireless sensor node receives the role assignment parameter, sets a value of a configurable attribute of the target wireless sensor node according to the role assignment parameter, and implements a function corresponding to the role assignment parameter.

The specific working flow of the above-mentioned apparatus embodiment is that, first, the determining unit 31 determines role assignment parameters of each target wireless sensor node, and then, the transmitting unit 32 transmits the role assignment parameters to the base station node, so that the base station node transmits the received role assignment parameters transmitted by the controller to each target wireless sensor node, so that each target wireless sensor node receives the role assignment parameters, and sets a value of configurable attributes of the target wireless sensor node itself according to the role assignment parameters, thereby implementing functions corresponding to the role assignment parameters.

Therefore, when the performance of the upper application of the WSN is expected to be adjusted, the role distribution parameters of each target wireless sensor node can be respectively determined, and then the role distribution parameters are sent to the base station node, so that the base station node sends the received role distribution parameters sent by the controller to each target wireless sensor node, and each target wireless sensor node can set the value of the configurable attribute of the target wireless sensor node according to the role distribution parameters, thereby realizing the function corresponding to the role distribution parameters, and solving the problem of strong coupling between the upper application of the WSN and the bottom protocol stack in the prior art.

In this embodiment of the present application, there may be many specific implementation manners of wireless sensor network networking, and in one implementation manner, in order to solve the problem that the coupling between the upper layer application and the bottom layer protocol stack of the WSN in the prior art is strong, the determining unit 31 is specifically configured to:

respectively determining information representing role distribution parameters of each target wireless sensor node;

and respectively determining the role distribution parameters of the target wireless sensor nodes according to the determined information.

In one embodiment, to meet the requirements of the upper layer application, the information may include at least one of the following:

network state information of the wireless sensor network;

modal information of the wireless sensor network;

and inputting information of the controller, which is used for representing the role assignment parameters of each target wireless sensor node, by a user.

In one embodiment, the network status information may be determined by the following functional units:

the receiving unit is used for receiving a sensing data packet sent by the wireless sensor node, wherein the sensing data packet comprises expected retransmission times and a network topology adjacency list;

the analysis unit is used for analyzing the sensing data packet;

and the information determining unit is used for determining the network state information according to the analyzed expected retransmission times and the network topology adjacency list.

In order to avoid that some wireless sensor nodes in the wireless sensor network may be in a dormant state when the wireless sensor network is in a Duty Cycle operating mode, so that the determined network state information of the wireless sensor network is incomplete, in an embodiment, when the network state information is the network state information of the whole wireless sensor network, the whole network state information of the wireless sensor network is determined by the following functional units:

and the integral determining unit is used for determining the integral network state information of the wireless sensor network according to the received sensing data packets sent by part of the wireless sensor nodes in the wireless sensor network.

In an embodiment, since the sensing packet includes the network state information of the wireless sensor node itself and the network state information of the neighboring node of the wireless sensor node, the overall determining unit is specifically configured to:

and determining the overall network state information of the wireless sensor network according to the network state information of each node in part of the wireless sensor nodes and the network state information of the neighbor nodes of each node.

In an embodiment, after determining the network state information of the whole wireless sensor network, the determining unit may be specifically configured to:

and determining role distribution parameters of each target wireless sensor node according to the performance requirement index value of the upper application and the determined network state information and mode information of the whole wireless sensor network.

In one embodiment, to facilitate data transmission between the controller and the base station node, and data transmission between the base station node and the wireless sensor node, the sending unit 32 is specifically configured to:

according to the role distribution parameters, a first data packet containing the role distribution parameters of the target wireless sensor nodes is constructed;

and sending the first data packet to the base station node, so that the base station node generates a corresponding role distribution data packet according to the first data packet, and sending the role distribution data packet to each target wireless sensor node, wherein the role distribution data packet comprises role distribution parameters of the target wireless sensor.

Example 3

Based on the same inventive concept as that in embodiments 1 and 2, an embodiment of the present application provides a networking apparatus for a wireless sensor network, where the wireless sensor network includes a controller, at least one base station node, and at least one wireless sensor node, where the at least one wireless sensor node includes at least one target wireless sensor node, and each target wireless sensor node has at least two configurable functions, as shown in fig. 4, and includes the following functional units:

a receiving unit 41, configured to receive a role assignment parameter sent by a base station node;

and the function implementation unit 42 is configured to set a value of the configurable attribute of the target wireless sensor node according to the role assignment parameter, and implement a function corresponding to the role assignment parameter.

The specific working flow of the above-mentioned device embodiment is that, first, the receiving unit 41 receives the role distribution parameter sent by the base station node, and then, the function implementing unit 42 sets the value of the configurable attribute of the target wireless sensor node according to the role distribution parameter, thereby implementing the function corresponding to the role distribution parameter. Therefore, when the performance of the upper application of the WSN is expected to be adjusted, the role distribution parameters sent by the base station node can be received, the value of the configurable attribute of the target wireless sensor node is set according to the role distribution parameters, and the function corresponding to the role distribution parameters is realized, so that the problem of strong coupling between the upper application and the bottom protocol stack of the WSN in the prior art can be solved.

In this embodiment of the present application, there may be many specific implementation manners of the wireless sensor network networking, and in an implementation manner, in order to avoid that some wireless sensor nodes perform unnecessary forwarding operations on received role distribution data packets, resulting in data redundancy, the receiving unit 41 is specifically configured to:

receiving a role distribution data packet;

and when the node is determined to realize the function of forwarding the role distribution data packet, forwarding the received role distribution data packet to a neighbor node of the node.

In an embodiment, in order to enable each target wireless sensor node to determine its role assignment parameter according to its own identifier after receiving the role distribution data packet, when the role distribution data packet includes a correspondence between the identifier of each target wireless sensor and the role assignment parameter, the receiving unit 41 is specifically configured to:

receiving a role distribution data packet;

and determining the role distribution parameters corresponding to the identifiers of the wireless sensor nodes according to the corresponding relation between the identifiers of the target wireless sensors in the role distribution data packet and the role distribution parameters.

In one embodiment, due to the Duty Cycle operating mode of the wireless sensor network and the unreliability of the wireless link, some wireless sensor nodes may miss the role distribution data packet sent in the above steps due to dormancy or unreliability of the wireless link, and thus functions between two adjacent wireless sensor nodes may not be allocated by the same role distribution process. Therefore, the role distribution packet may further include a first version number, where the first version number is used to distinguish the role distribution parameters sent by the controller each time, and the apparatus further includes:

the adding unit is used for adding the first version number into a second data packet to be sent after the function corresponding to the determined role distribution parameter is realized;

and the sending unit is used for sending the second data packet added with the first version number to the neighbor node of the node.

In one embodiment, in order to avoid inconsistency of function versions between adjacent nodes in data transmission of the wireless sensor node, the apparatus further includes:

the version number determining unit is used for determining a second version number which is contained in a received third data packet and used for distinguishing role distribution parameters sent by the controller each time after the third data packet sent by the first neighbor node is received;

the version number comparison unit is used for comparing the version of the self function of the node with the old version of the function of the first neighbor node according to the first version number and the second version number;

and the realization unit is used for sending the role distribution data packet corresponding to the version of the self function of the wireless sensor node to the first neighbor node when the version of the self function of the wireless sensor node is a new version relative to the version of the function of the first neighbor node, so that the first neighbor node realizes the function corresponding to the role distribution data packet according to the role distribution parameters contained in the role distribution data packet.

In one embodiment, the apparatus further comprises:

the request unit is used for requesting the first neighbor node to send a role distribution data packet corresponding to the version of the function of the first neighbor node to the local node when the version of the function of the wireless sensor node is an old version relative to the version of the function of the first neighbor node;

and the function realization unit is used for realizing the function corresponding to the role distribution data packet according to the role distribution parameters contained in the role distribution data packet sent by the first neighbor node.

In one embodiment, the apparatus further comprises:

the receiving unit is used for receiving a first sensing data packet sent by a second neighbor node, and the first sensing data packet comprises sensing data acquired by the second neighbor node and a network state of the second neighbor node;

the mode determining unit is used for determining the mode of the sensing data according to the received first sensing data packet;

the condition judging unit is used for judging whether the node realizes the function of forwarding the data of the mode and whether the network state of the second neighbor node meets the forwarding condition;

and the forwarding unit is used for forwarding the received sensing data packet if the node is determined to realize the function of forwarding the data in the mode and the network state of the second neighbor node meets the forwarding condition.

Example 4

Based on the same inventive concept as that in embodiments 1, 2 and 3, an embodiment of the present application provides a networking system of a wireless sensor network, as shown in fig. 5, where the wireless sensor network includes a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node, and each target wireless sensor node has at least two configurable functions.

sending the role assignment parameter to the base station node;

the base station node is configured to send the received role assignment parameter sent by the controller to each target wireless sensor node;

Optionally, the controller is specifically configured to:

and respectively determining role distribution parameters of the target wireless sensor nodes according to the information.

Optionally, the information includes at least one of the following:

network state information of the wireless sensor network;

modal information of the wireless sensor network;

inputting, by a user, information of the controller characterizing role assignment parameters of each of the target wireless sensor nodes.

Optionally, when the information includes network state information of the wireless sensor network, the controller is specifically configured to:

receiving a sensing data packet sent by the wireless sensor node, wherein the sensing data packet comprises expected retransmission times and a network topology adjacency list;

analyzing the perception data packet;

and determining the network state information according to the analyzed expected retransmission times and the network topology adjacency list.

Optionally, the network state information is the network state information of the whole wireless sensor network;

the controller is specifically configured to:

and determining the whole network state information of the wireless sensor network according to the received sensing data packets sent by part of the wireless sensor nodes in the wireless sensor network.

Optionally, the sensing data packet includes network state information of the wireless sensor node itself and network state information of a neighboring node of the wireless sensor node;

the controller is specifically configured to:

and determining the overall network state information of the wireless sensor network according to the network state information of each node in the partial wireless sensor nodes and the network state information of the neighbor nodes of each node.

Optionally, the controller is specifically configured to:

according to the role distribution parameters, constructing a first data packet containing the role distribution parameters of each target wireless sensor;

sending the first data packet to a base station node; and enabling the base station node to generate a corresponding role distribution data packet according to the first data packet, and sending the role distribution data packet to each target wireless sensor node, wherein the role distribution data packet comprises role distribution parameters of each target wireless sensor.

Optionally, each target wireless sensor node is specifically configured to:

receiving the role distribution data packet;

Optionally, the role distribution data packet includes a correspondence between an identifier of each target wireless sensor and a role distribution parameter; each of the target wireless sensor nodes is specifically configured to:

receiving the role distribution data packet;

determining role distribution parameters corresponding to the identifiers of the nodes according to the corresponding relation between the identifiers of the target wireless sensors in the role distribution data packet and the role distribution parameters;

and according to the role distribution parameters, realizing the functions corresponding to the determined role distribution parameters.

Optionally, the role distribution data packet further includes a first version number, where the first version number is used to distinguish the role distribution parameter sent by the controller each time, and the target wireless sensor node is specifically configured to:

after the function corresponding to the determined role distribution parameter is realized, adding the first version number into a second data packet to be sent;

and sending the second data packet added with the first version number to a neighbor node of the node.

Optionally, the target wireless sensor node is specifically configured to:

after a third data packet sent by a first neighbor node is received, determining a second version number which is contained in the received third data packet and used for distinguishing role distribution parameters sent by the controller each time;

comparing the version of the self function of the node with the old and new of the version of the function of the first neighbor node according to the first version number and the second version number;

and when the version of the self function of the wireless sensor node is a new version relative to the version of the function of the first neighbor node, sending a first role distribution data packet corresponding to the version of the self function of the wireless sensor node to the first neighbor node, so that the first neighbor node realizes the function corresponding to the first role distribution data packet according to role distribution parameters contained in the first role distribution data packet.

Optionally, the target wireless sensor node is specifically configured to:

when the version of the self function of the wireless sensor node is an old version relative to the version of the function of the first neighbor node, requesting the first neighbor node to send a second role distribution data packet corresponding to the version of the function of the first neighbor node to the local node;

and realizing the function corresponding to the second role distribution data packet according to the role distribution parameters contained in the second role distribution data packet.

Optionally, each of the wireless sensor nodes is further specifically configured to:

receiving a first sensing data packet sent by a second neighbor node, wherein the first sensing data packet comprises sensing data collected by the second neighbor node and a network state of the second neighbor node;

determining a first mode of perception data according to the received first perception data packet;

and if the node is determined to realize the function of forwarding the data in the first mode and the network state of the second neighbor node meets the forwarding condition, forwarding the received sensing data packet.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. The networking method of the wireless sensor network is characterized in that the wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable functions; the method comprises the following steps:

the controller respectively determines role distribution parameters of each target wireless sensor node;

sending the role distribution parameters to the base station nodes so that the base station nodes send the received role distribution parameters sent by the controller to the target wireless sensor nodes, so that the target wireless sensor nodes receive the role distribution parameters, and setting the values of the configurable attributes of the target wireless sensor nodes according to the role distribution parameters to realize the functions corresponding to the role distribution parameters;

wherein the determining the role assignment parameters of the target wireless sensor nodes respectively comprises: respectively determining information representing role distribution parameters of each target wireless sensor node; according to the information, role distribution parameters of the target wireless sensor nodes are respectively determined, and the information comprises at least one of the following: network state information of the wireless sensor network; modal information of the wireless sensor network; inputting, by a user, information characterizing role assignment parameters of each of the target wireless sensor nodes of the controller;

the network state information is determined by:

analyzing the perception data packet;

2. The method according to claim 1, wherein when the network status information is the network status information of the whole wireless sensor network, the network status information of the whole wireless sensor network is determined by the following method:

3. The method of claim 2, wherein the sensing data packet includes network state information of the wireless sensor node itself and network state information of a neighboring node of the wireless sensor node, and the determining of the network state information of the whole wireless sensor network specifically includes:

4. The method of any one of claims 1 to 3, wherein determining the role assignment parameter for each of the target wireless sensor nodes comprises:

5. The method of claim 1, wherein sending the role assignment parameter to the base station node specifically comprises:

constructing a first data packet containing role distribution parameters of each target wireless sensor node according to the role distribution parameters;

and sending the first data packet to a base station node, so that the base station node generates a corresponding role distribution data packet according to the first data packet, and sends the role distribution data packet to each target wireless sensor node, wherein the role distribution data packet comprises role distribution parameters of each target wireless sensor.

6. The networking method of the wireless sensor network is characterized in that the wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable functions; the method is applied to each target wireless sensor node, and comprises the following steps:

receiving role distribution parameters sent by the base station node, wherein the role distribution parameters are determined in the following way: the controller determines information representing role distribution parameters of each target wireless sensor node; according to the information, role distribution parameters of the target wireless sensor nodes are respectively determined, and the information comprises at least one of the following: network state information of the wireless sensor network, modal information of the wireless sensor network and information of role distribution parameters of the controller representing the target wireless sensor nodes are input by a user; the network state information is determined by: the controller receives perception data packets sent by the wireless sensor nodes, wherein the perception data packets comprise expected retransmission times and a network topology adjacency list; the controller analyzes the sensing data packet and determines the network state information according to the analyzed expected retransmission times and a network topology adjacency list;

7. The method of claim 6, wherein receiving the role assignment parameters sent by the base station node specifically comprises:

receiving the role distribution data packet;

8. The method according to claim 7, wherein when the role distribution packet includes a correspondence between an identifier of each of the target wireless sensors and a role assignment parameter, receiving the role distribution packet specifically includes:

receiving the role distribution data packet;

and determining the role distribution parameters corresponding to the identifiers of the node according to the corresponding relation between the identifiers of the target wireless sensors in the role distribution data packet and the role distribution parameters.

9. The method of claim 8, wherein the character distribution packet further includes a first version number, the first version number being used to distinguish the character allocation parameters transmitted by the controller each time, the method further comprising:

10. The method of claim 9, wherein the method further comprises:

11. The method of claim 10, wherein the method further comprises:

12. The method of claim 11, wherein the method further comprises:

and if the node is determined to realize the function of forwarding the data in the mode and the network state of the second neighbor node meets the forwarding condition, forwarding the received sensing data packet.

13. The networking device of the wireless sensor network is characterized in that the wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable roles; the device comprises:

a determining unit, configured to determine role assignment parameters of the target wireless sensor nodes, respectively, where the determining unit determines the role assignment parameters of the target wireless sensor nodes, respectively, and includes: respectively determining information representing role distribution parameters of each target wireless sensor node; according to the information, role distribution parameters of the target wireless sensor nodes are respectively determined, and the information comprises at least one of the following: network state information of the wireless sensor network; modal information of the wireless sensor network; inputting, by a user, information characterizing role assignment parameters of each of the target wireless sensor nodes of the controller; the network state information is determined by: receiving a sensing data packet sent by the wireless sensor node, wherein the sensing data packet comprises expected retransmission times and a network topology adjacency list; analyzing the perception data packet; determining the network state information according to the analyzed expected retransmission times and a network topology adjacency list;

14. The networking device of the wireless sensor network is characterized in that the wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable roles, and the device comprises:

a receiving unit, configured to receive a role assignment parameter sent by the base station node, where the role assignment parameter is determined in the following manner: determining information representing role distribution parameters of each target wireless sensor node; according to the information, role distribution parameters of the target wireless sensor nodes are respectively determined, and the information comprises at least one of the following: network state information of the wireless sensor network, modal information of the wireless sensor network and information of role distribution parameters of the controller representing the target wireless sensor nodes are input by a user; the network state information is determined by: the controller receives a sensing data packet sent by the wireless sensor node, wherein the sensing data packet comprises expected retransmission times and a network topology adjacency list; the controller analyzes the sensing data packet and determines the network state information according to the analyzed expected retransmission times and a network topology adjacency list;

15. The networking system of the wireless sensor network is characterized in that the wireless sensor network comprises a controller, at least one base station node and at least one wireless sensor node; the at least one wireless sensor node comprises at least one target wireless sensor node; each target wireless sensor node has at least two configurable roles;

the controller is configured to determine role assignment parameters of each target wireless sensor node, and the determining the role assignment parameters of each target wireless sensor node includes: respectively determining information representing role distribution parameters of each target wireless sensor node; according to the information, role distribution parameters of the target wireless sensor nodes are respectively determined, and the information comprises at least one of the following: network state information of the wireless sensor network; modal information of the wireless sensor network; inputting, by a user, information characterizing role assignment parameters of each of the target wireless sensor nodes of the controller; the network state information is determined by: the controller receives a sensing data packet sent by the wireless sensor node, wherein the sensing data packet comprises expected retransmission times and a network topology adjacency list; the controller analyzes the sensing data packet and determines the network state information according to the analyzed expected retransmission times and a network topology adjacency list;

sending the role assignment parameter to the base station node;