WO2021051859A1 - 基于自适应遗传算法的无线传感器网络分簇路由方法 - Google Patents
基于自适应遗传算法的无线传感器网络分簇路由方法 Download PDFInfo
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- H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Definitions
- the invention relates to the technical field of a wireless sensor network cluster routing method, in particular to a wireless sensor network cluster routing method based on an adaptive genetic algorithm.
- the wireless sensor network consists of many battery-powered sensor devices. These devices can perceive some physical characteristics of the surrounding environment to obtain various data, such as sound, pressure, humidity, temperature, or chemical concentration.
- each sensor node has the ability to perform simple calculations or directly communicate with other nodes and base stations. The node will transmit the collected data to the base station for further analysis and processing.
- wireless sensor networks are widely used in air quality monitoring, health monitoring, water quality monitoring, home safety and other fields.
- the clustered network structure has good scalability, is convenient for energy management, load balance, resource allocation and other advantages, many people have conducted in-depth research on the wireless sensor network clustering routing protocol.
- the energy of the nodes in the wireless sensor network is provided by their own miniature batteries. Generally, the batteries cannot be replaced, so the use time of the wireless sensor network is limited by energy.
- the cluster head sends the fused data to the sink node after fusing the data of the cluster, which reduces the amount of data sent and also reduces energy consumption.
- the cluster head is responsible for the establishment of the cluster, the communication control within the cluster, and the communication between the cluster and the sink node.
- the purpose of the present invention is to provide a wireless sensor network cluster routing method based on an adaptive genetic algorithm to solve the problems of poor real-time performance, short network life, and low data transmission efficiency of current cluster routing protocols using complex intelligent algorithms.
- the technical solution of the present invention is to provide a wireless sensor network cluster routing method based on an adaptive genetic algorithm, which includes the following steps:
- Step 1 In the monitoring area, randomly and evenly deploy sensor nodes to establish a network energy consumption model. Each node has a unique ID and the initial energy is the same. The nodes can judge the relative distance according to the strength of the received signal;
- Step 2 Use the initial position and energy information of the sensor node to initialize the population
- Step 3 Individuals in the population calculate fitness values based on the sensor node position and energy information, and perform elite retention and adaptive cross-mutation operations based on the fitness values to generate a new population. Each point on the individual has a chance of crossover and mutation, crossover And the probability of mutation will be adjusted non-linearly with the size of individual fitness;
- Step 4 Determine whether the fitness value reaches the iteration stop condition, if not, go to step 3, if the iteration is completed, cluster the nodes according to the clustering scheme in the optimal individual;
- Step 5 Determine whether the cluster head is within the communication range of the base station. If it is, the cluster head communicates directly with the base station; if not, continue to select the relay node according to the distance between the cluster heads, and route the data packet to the relay node until The data packet is transmitted to the base station.
- the energy consumption of the node is: among them Represents the distance threshold, E elec represents the energy consumed to send or receive 1-bit data, and ⁇ fs and ⁇ mp represent the power amplification coefficients under different communication distances.
- the iteration stop condition is that the iteration stops after reaching any value between 30 and 50 times.
- the population size is m
- the population set is:
- C(x) represents the xth individual in the population
- the length of each individual is the number of sensor nodes n
- B i represents the values of individual genes
- the value B i T (s) determined by the node S i energy, average energy and a network node survival threshold
- T (s) as follows Shown:
- p is the ratio of the number of cluster heads to the total number of nodes
- r is the current round number
- G is the set of nodes that have not become cluster heads in the past 1/p round.
- p is 0.05.
- the fitness value function of the xth individual in the population is: Among them E avg , sumD CH ⁇ BS (x), sumD S ⁇ CH (x) respectively represent the average energy of the nodes, the sum of the distances from each cluster head node to the base station and the sum of the distances between the member nodes and the corresponding cluster head, minpopD CH ⁇ BS Represents the minimum sum of the distances from each cluster head node of all individuals in the population to the base station, minpopD S ⁇ CH represents the minimum sum of the distances from the member nodes of all individuals in the population to the corresponding cluster head, avgpopD CH ⁇ BS represents the population in the population The average value of the sum of the distances from the cluster head nodes of all individuals to the base station, avgpopD S ⁇ CH represents the average value of the sum of the distances from the member nodes of all individuals in the population to the corresponding cluster head.
- the invention provides a wireless sensor network cluster routing method based on an adaptive genetic algorithm, which improves the selection, crossover and mutation mechanism of the genetic algorithm, improves the algorithm's global search capability and convergence speed, and solves the problem of using existing application intelligent algorithms
- the clustering routing protocol has the problem of poor real-time performance while ensuring the validity of the protocol; in the clustering process, the distance between each node and the cluster head node, the distance between the cluster head node and the base station, and the remaining energy of each node are considered.
- the cluster heads are selected according to the factors.
- the cluster head nodes communicate with the base station in a multi-hop manner according to the distance between the cluster heads and the neighboring cluster heads, which improves the network life and data transmission efficiency.
- FIG. 1 is a schematic diagram of a network structure of a wireless sensor network cluster routing based on an adaptive genetic algorithm according to an embodiment of the present invention
- FIG. 2 is a schematic flowchart of steps of a wireless sensor network cluster routing method based on an adaptive genetic algorithm according to an embodiment of the present invention
- Embodiment 3 is a schematic structural diagram of an adaptive crossover operation module provided by Embodiment 1 of the present invention.
- Embodiment 4 is a schematic structural diagram of an adaptive mutation operation module provided by Embodiment 1 of the present invention.
- Embodiment 1 of the present invention is a schematic diagram of the structure of an adaptive crossover operator curve provided by Embodiment 1 of the present invention.
- FIG. 6 is a schematic diagram of the curve structure of an adaptive mutation operator provided by Embodiment 1 of the present invention.
- FIG. 7 is an actual simulation diagram of the adaptive crossover probability according to the adaptation value provided by Embodiment 1 of the present invention.
- FIG. 8 is an actual simulation diagram of the adaptive mutation probability according to the adaptation value according to the first embodiment of the present invention.
- the core idea of the present invention is that the present invention provides a wireless sensor network cluster routing method based on adaptive genetic algorithm, which improves the selection, crossover and mutation mechanism of genetic algorithm, improves the algorithm’s global search capability and convergence speed, and solves The problem of poor real-time performance while ensuring the validity of the protocol while ensuring the validity of the clustering routing protocol using the existing application of intelligent algorithms; in the clustering process, the distance between each node and the cluster head node, and the distance between the cluster head node and the base station is considered As well as the remaining energy of each node to select the cluster head, the cluster head node communicates with the base station in a multi-hop manner according to the distance between the cluster head and the neighboring cluster head, which improves the network life and data transmission efficiency.
- FIG. 1 is a schematic diagram of a network structure of a wireless sensor network cluster routing based on an adaptive genetic algorithm provided by an embodiment of the present invention.
- the network structure of the cluster routing of the wireless sensor network based on the adaptive genetic algorithm includes several cluster structures 11 and base stations 12.
- Each cluster structure 11 includes a cluster head node 111 and a number of ordinary nodes 112.
- the sensor node collects data information of the surrounding environment, and transmits the collected data to the base station 12 through multiple hops for further analysis and processing.
- FIG. 2 is a schematic flowchart of steps of a wireless sensor network cluster routing method based on an adaptive genetic algorithm provided by an embodiment of the present invention.
- a cluster routing method for wireless sensor networks based on adaptive genetic algorithm includes the following steps:
- each node has a unique ID and the initial energy is the same.
- the nodes can judge the relative distance according to the strength of the received signal;
- S25 Determine whether the cluster head is within the communication range of the base station. If so, the cluster head communicates directly with the base station; if not, continue to select a relay node according to the distance between the cluster heads, and route the data packet to the relay node until the data The packet is transmitted to the base station.
- the established network energy consumption model if the node needs to send 1 bit of data to the node whose distance is d, the energy consumption of the node is: among them Represents the distance threshold, E elec represents the energy consumed to send or receive 1-bit data, and ⁇ fs and ⁇ mp represent the power amplification coefficients under different communication distances.
- the population size is m
- the population set is:
- C(x) represents the xth individual in the population, and the length of each individual is the number of sensor nodes n
- B i represents the values of individual genes
- the value B i T (s) determined by the node S i energy, average energy and a network node survival threshold
- T (s) as follows Shown:
- p is the ratio of the number of cluster heads to the total number of nodes
- r is the current round number
- G is the set of nodes that have not become cluster heads in the past 1/p round.
- p is 0.05.
- m 20.
- the fitness value function of the xth individual in the population is: Among them E avg , sumD CH ⁇ BS (x), sumD S ⁇ CH (x) respectively represent the average energy of the nodes, the sum of the distances from each cluster head node to the base station and the sum of the distances between the member nodes and the corresponding cluster head, minpopD CH ⁇ BS Represents the minimum sum of the distances from each cluster head node of all individuals in the population to the base station, minpopD S ⁇ CH represents the minimum sum of the distances from the member nodes of all individuals in the population to the corresponding cluster head, avgpopD CH ⁇ BS represents the population in the population The average value of the sum of the distances from the cluster head nodes of all individuals to the base station, avgpopD S ⁇ CH represents the average value of the sum of the distances from the member nodes of all individuals in the population to the corresponding cluster head.
- the elite retention in the embodiment of the present invention saves the individual H with the highest fitness value in the current population, and allows the individual to H continues to participate in crossover and mutation operations. If the L fitness value of the worst-performing individual in the next generation is less than that of the previous generation individual H, then the H individual will directly replace the L individual.
- the elite retention strategy can prevent the optimal individual from being destroyed due to crossover and mutation operations.
- FIG. 3 is a schematic structural diagram of an adaptive crossover operation module provided by Embodiment 1 of the present invention.
- the crossover operation is to exchange and recombine the partial structures of the two chromosomes to generate new individuals. Through crossover recombination, the search capability of the genetic algorithm is greatly improved.
- the embodiment of the present invention adopts a two-point crossover method. First, a random number C rand (x) in the range of 0 to 1 is randomly generated for the individual x in the population.
- C rand (x) ⁇ P c (x) If C rand (x) ⁇ P c (x), then randomly select two gene cut points CP 1 and CP 2 on the x individual, and compare the genes between CP 1 to CP 2 on the x individual with the x+2 Interchange of genes in corresponding positions of individuals.
- FIG. 4 is a schematic structural diagram of an adaptive mutation operation module provided by Embodiment 1 of the present invention.
- the mutation operation is based on this phenomenon.
- M rand (B i ) In the process of evolution, some errors may occur that may lead to gene mutations.
- the mutation operation is based on this phenomenon.
- M rand (B i ) In the process of evolution, some gene values on the chromosome are mutated, the purpose is to increase the diversity of the population and avoid falling into the local optimum.
- the crossover probability P c and the mutation probability P m are usually fixed values. If P c or P m is too large, the individual structure with a higher fitness value will be easily destroyed, and the algorithm will fall into random search and lose The meaning of genetic algorithm iterative optimization; if P c or P m is too small, the generation of new individuals in the population will also become difficult, leading to stagnation in the evolutionary process and falling into a local optimum. Therefore, when using the classical genetic algorithm to solve different problems, it is necessary to continuously adjust until the appropriate crossover probability and mutation probability are selected, which increases the workload. In order to solve this problem, some researchers have proposed a new adaptive genetic algorithm (New Adaptive Genetic Algorithm, NAGA), in order to avoid falling into the local optimum, NAGA improved the crossover and mutation operators on the basis of AGA, its definition for:
- NAGA New Adaptive Genetic Algorithm
- f max is the maximum fitness value
- f avg is the average fitness value
- f min is the minimum fitness value
- f′ is the larger fitness value of the two individuals crossing over
- f is the fitness value of the current individual
- P m1 >P m2 >P m3 is the fitness value of the current individual
- NAGA prevents the algorithm from falling into the local optimal situation to a certain extent, it ignores the distribution of the number of individuals. If the method in NAGA is used to adjust the probability of crossover and mutation linearly with the size of individual fitness, some good individual structures in the population may still be destroyed.
- P c and P m should change slowly when the individual fitness value is low and maintain at a higher level; P c and P m also change slowly when the individual fitness value is high, and maintain a higher level. While maintaining the diversity of the population, this operation preserves more of the structure of good individuals. In other words, the probability of crossover and mutation should be adjusted nonlinearly with the size of individual fitness.
- the first embodiment of the present invention uses the Sigmoid function to quantify the adaptive adjustment of the crossover and mutation probability. Non-linear change requirements.
- FIG. 5 is a schematic diagram of the structure of an adaptive crossover operator curve provided by Embodiment 1 of the present invention. Referring to Figure 5, the maximum value of individual fitness in the population is given a smaller crossover probability to avoid falling into a local optimal state. The minimum value of individual fitness in the population is given a larger crossover probability in order to obtain a satisfactory Fitness value.
- FIG. 6 is a schematic diagram of the structure of an adaptive mutation operator curve provided by Embodiment 1 of the present invention. Referring to Figure 6, the maximum individual fitness value in the population gives a smaller mutation probability to avoid falling into a local optimal state, and the minimum individual fitness value in the population gives a larger mutation probability in order to obtain a satisfactory Fitness value.
- FIG. 7 is an actual simulation diagram of the adaptive crossover probability according to the adaptation value according to the first embodiment of the present invention
- FIG. 8 is an actual simulation diagram of the adaptive mutation probability according to the adaptation value according to the first embodiment of the present invention. Referring to Figure 7 and Figure 8, when most fitness values are at a relatively low level, their cross mutation probability is set to be relatively high.
- the iteration stop condition is that the iteration stops after reaching any value between 30 and 50 times.
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- 一种基于自适应遗传算法的无线传感器网络分簇路由方法,其特征在于,包括以下步骤:步骤1:在监测区域内,随机均匀部署传感器节点,建立网络能耗模型,每个节点都有唯一的ID标识且初始能量相同,节点能根据接收到的信号强弱判断相对距离;步骤2:利用传感器节点的初始位置和能量信息进行种群初始化操作;步骤3:种群中个体根据传感节点位置和能量信息计算适应值,并根据适应值进行精英保留以及自适应交叉变异操作,产生新种群,个体上每个点都有几率发生交叉和变异,交叉和变异的概率随着个体适应值的大小进行非线性调整;步骤4:判断所述适应值是否达到迭代停止条件,若否,则转至步骤3,若迭代完成,则根据最优个体中的分簇方案对节点进行分簇;步骤5:判断簇头是否在基站的通信范围内,如果是,则簇头直接与基站通信;如果不是,继续根据簇头间的距离选择中继节点,将数据包路由至中继节点,直到数据包被传送至基站。
- 如权利要求1所述的基于自适应遗传算法的无线传感器网络分簇路由方法,其特征在于,所述迭代停止条件为迭代达到30至50次之间任意值之后停止。
- 如权利要求4所述的基于自适应遗传算法的无线传感器网络分簇路由方法,其特征在于,p取0.05。
- 如权利要求1所述的基于自适应遗传算法的无线传感器网络分簇路由方法,其特征在于,所述精英保留:在保存当前种群中适应值最高的个体H的同时,让个体H继续参与交叉和变异操作,若下一代中表现最差的个体L适应值小于上一代的个体H,则用H个体直接替换掉L个体,设集合C max={C max(k):f[C max(k)]=max[f(C(k))]|C max(k)∈Pop(k),k=1,2,…}C min={C min(k):f[C min(k)]=min[f(C(k))]|C min(k)∈Pop(k),k=1,2,…},其中C max(k)和C min(k)分别表示第k代种群Pop(k)中的最优个体和最劣个体,f[C max(k)]和f[C min(k)]为相应个体的适应值,若f[C max(k)]>f[C min(k+1)],则:C min(k+1)=C max(k),f[C min(k+1)]=f[C max(k)]。
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