97 results about "Mobile sink" patented technology

The invention relates to an information passing method of a wireless sensor network. According to the method, a sensing area is designed into a grid structure. Each grid unit has only one cluster head node. The cluster head nodes are responsible for communicating with the cluster head nodes in adjacent grid units. Mobile sink nodes select to communicate with the cluster head nodes in the nearest grid units. Alternation of the cluster head node in each grid unit is decided according to surplus energy and distance to the center of the grid unit, and the node with the highest surplus energy is taken as the cluster head node. Two mobile sink nodes are deployed at the periphery of the sensing region. According to the method, the existing defects that energy holes are liable to appear due to rapid energy consumption and the life cycle of the wireless sensor network is reduced are overcome. According to the method, the traffic load that the sink nodes broadcast positions to the network is reduced, the energy hole phenomenon is avoided, the extra energy consumption is avoided, the transmission number of hops of the node data is reduced, and the service life of the network is prolonged.

A method, apparatus, and computer program product are provided for routing data packets through a wireless sensor network to a mobile sink in a relatively quick and efficient manner while utilizing low protocol overhead. Additionally, a method, apparatus, and computer program product are provided such that a sensor node within a wireless sensor network maintains sink information and routing information to facilitate efficient delivery of a data packet to a mobile sink within a wireless sensor network.

The invention discloses a mobile Sink path planning method for an underwater heterogeneous sensor network. The method comprises the following steps: a dual-layer topology network structure is established; an optimal aggregation node laying location is selected by adopting a fitness function and a grid method; a mobile Sink plans the shortest mobile path and mobiles to transverse all aggregation nodes; a shore-based monitoring center sends a remote control command to the mobile Sink in a multi-hop way through the aggregation node upper network; the mobile Sink changes the mobile path in real time according to the control command. The collection and transmission of the network monitoring data are realized through a multi-mode communication way of the underwater sound and laser communicationand the mobility of the mobile Sink, thereby effectively improving the bottleneck problem that the underwater communication rate and the distance are in conflict.

The invention discloses a route recovery method and a recovery protocol for a mobile Sink wireless sensor network. The method and the protocol are characterized in that: when the location of a mobile Sink is changed to disconnect a path of the mobile Sink wireless sensor network, current information may be collected to update a route map, and path coding is performed; an optimal alternative path is selected by adopting an immune orthogonal learning particle swarm optimization algorithm to perform route recovery; and a network system is maintained by adopting the protocol based on the immune orthogonal learning particle swarm optimization algorithm. The immune orthogonal learning particle swarm optimization algorithm has the characteristics of relatively higher global searching capability, relatively higher solution accuracy, high rate of convergence and the like. By the method and the protocol, the route maintenance capability of the mobile Sink wireless sensor networks is improved, the maximum transmission success rate is realized by utilizing the shortest transmission path, network throughput is improved, and the time to live of the network is prolonged.

The present invention relates to an ant colony algorithm-based mobile Sink node data collecting method. A wireless sensor network performs clustering operation on sensor nodes by using an LEACH protocol so as to obtain cluster head nodes; the cluster head node collects data of member nodes in a cluster; an important degree of the data is marked by using hormone information through an improved ant colony algorithm; adjacent matrixes are calculated according to a hormone concentration of each member node in the cluster and with an Euclidean distance between cluster head nodes as a visibility factor; all cluster head nodes are traversed; an optimal moving path of Sink nodes is searched; and finally, the Sink nodes are moved according to the optimal path. The present invention provides a method for solving problems of funnel effect and energy hole in data collection of the wireless sensor network. The method can ensure that important information is sent in time in the network, and effectively shortens data time delay.

The invention relates to a lifetime optimization method of a mobile Sink-based wireless sensor network. The method includes the following steps that: 1) after the network is started, a sink node broadcasts an information query packet and receives the position coordinate information of sensor nodes, and adds the position coordinate information of the sensor nodes into a sensor node information table of the Sink node; 2) the Sink node analyzes constraint conditions, and establishes a data transmission delay and hop count-constrained network lifetime optimization model; 3) the Sink node uses a modified genetic algorithm to solve a network lifetime optimization model, and optimal schemes about network lifetime, the movement path of the Sink node and stay time at each stay position of the Sink node are calculated. With the lifetime optimization method of the mobile Sink-based wireless sensor network of the invention adopted, network lifetime can be prolonged, and node energy consumption and node data loss can be decreased.

The invention provides an energy-efficient routing algorithm (MEERP) for a wireless sensor network, and belongs to the technical field of the wireless sensor network application. This algorithm introduces a mobile sink node and a mobile relay node, considers a size of the network and a quantity of the nodes, and divides the network into several square areas; and then according to a weight sum of node residual energy and a cluster barycentric coordinate distance, a cluster head is selected. The nodes in a grid is communicated with a cluster head node through a multi-hop manner; a controllable mobile strategy is used for the mobile sink node, and when the mobile sink node moves to near the cluster head node, the cluster head node directly sends collected data to the mobile sink node; and a regular mobile manner is used for the mobile relay node in the network, and when the mobile relay node moves to a same position as a sensor node, the mobile relay node takes a forwarding task of all packets of the sensor node, but the sensor node only sends data which are sensed by the sensor node. This algorithm is mainly used in the wireless sensor network route control field.

The invention relates to a WSN of a mobile sink and a mobile sink data collection method based on a greedy path. The WSN comprises one mobile sink node and more than two sensor nodes. The method comprises the steps that the WSN is divided into a plurality of clusters with the balanced sizes; the mobile sink node determines one greedy path for accessing the clusters in sequence; the mobile sink accesses all cluster nodes repeatedly by means of the determined path and collects signals; the signals of the cluster nodes are transmitted to the mobile sink in one-hop or multi-hop mode through the adjacent clusters in the path; in a data collection process, a timer mechanism is adopted for avoiding processing of repeated data, and energy consumption of the sensor nodes is reduced. According to the method, time delay of data collection is shortened, energy consumption of a network is balanced, and service life of the network is prolonged.

The invention provides a mobile assistance WSNs routing method based on unequal clustering, comprising an initial phase, a clustering phase, an RPs (rendezvous points) determining phase and a routing phase. The initial phase is a network deployment phase and determines the movement track of a sink. The clustering phase considers factors such as the distance gradient between a point and a mobile sink, the rest energy of a candidate cluster head, etc. The RPs determining phase discusses the selection number and width of an RPs set, and specific sets, and simplifies a 0-1 integer programming model specific to the selection problem of an RP salve cluster head point set, wherein an approximately optimal RPs slave point set of an integer programming solution is obtained through a genetic algorithm. The routing phase employs multiple levels of routing, wherein the cluster head collects cluster member message data (including data fusion) and plays the role of a relay point, and PRs buffer messages transmitted by cluster head points into the mobile sink.

The invention discloses a mobile Sink data collection method for a wireless sensor network based on a tree cluster. The method comprises the steps of establishing a distributed tree cluster; calculating node weights by taking surrounding energy and density information of nodes into comprehensive consideration; selecting suitable root nodes as resident points RPs of a mobile Sink through distributed information exchange of a local range; accessing all RPs by the mobile Sink for data collection in a stable data collection stage; providing a new conditional re-clustering method; setting data collection number of rounds; and selecting new RPs for alternation. According to the method, the hotspot problem can be effective mitigated; the network load can be balanced; the energy consumption of nodes can be reduced; and the network lifetime can be prolonged.

The invention provides a data transmission method for a wireless sensor network with a mobile sink node. The wireless sensor network is divided into a plurality of areas through application of the particle swarm optimization; a sensor node is selected from the sensor nodes of each area as a cluster head through application of a similar clustering algorithm; cluster heads communicating with the mobile sink node are determined through three data messages of hello, message-s and message-h. According to the method, an energy hole phenomenon is eliminated, network traffic loads are mitigated, the throughput of the whole wireless sensor network is improved, and a life cycle of the wireless sensor network is greatly prolonged.

The invention discloses a mobile Sink data collection method applied to a wireless sensor network and used for node internal-memory resource sharing. A mobile Sink moves along a preset track at a constant speed, stops RP points uniformly distributed in the network and collects node data in a K jump generation tree formed by taking the RP point as a root. Caching emergency and time emergency are defined, and internal-memory pressure can be relieved by sharing internal-memory resources with adjacent nodes in a same tree when nodes are in caching emergency, and internal-memory pressure can be received by sharing internal-memory resources of adjacent trees when the tree is in caching emergency. Packet loss caused by overflow of internal memory of the nodes is reduced through internal-memory resource sharing among the nodes. During time emergency, the nodes actively upload data packets of time emergency to the mobile Sink, so that the data packets are disabled to exceed a deadline due to transmission delay.

The present invention provides a sink assembly formed from a plurality of injection molded plastic panels having integrated connectors which are capable of being packaged and shipped in a knock-down state and constructed to form an aesthetically pleasing sink assembly. The integrated connection of the side walls, front, back, and bottom panels and sink components simplifies the sink assembly construction. The panels are formed of injection molded plastic to interlock with one another without the need for fasteners or connectors. The system incorporates a minimum number of connectors by integrally forming the connectors into the panels which are snapped together to complete the assembly.

The invention discloses a wireless sensor network mobile sink data collection method based on data value dynamic estimation, and belongs to the field of sensor networks. The method comprises the steps that a data spatial distribution graph is constructed through combination of historical data; data collection order of sensing nodes in a sensing network is confirmed according to the data spatial distribution graph; and a sink node is enabled to complete data collection of the sensing nodes in the sensing network according to the data collection order. The data spatial distribution graph is constructed and time and space correlation of the data is taken into the sink node to be the consideration factor of data collection so that possibility that an objective result cannot be obtained later due to high similarity of the acquired data can be avoided, waste of network resources can be reduced and the statement period of the network can be prolonged.

The invention discloses a development method of Sink nodes of a mobile wireless sensor network (WSN), belongs to the field of data aggregation of the WSN, and mainly solves the problems that during a traditional data aggregation of a WSN, the Sink nodes are difficult to deploy, sensing fields are not communicated, energy easy to remain in the fields are unbalanced, and the like. The development method is characterized in that the development method comprises the steps that (1) a miniature four-rotor aircraft is adopted as a moving platform of the mobile Sink nodes; (2) the path obtained by the optimal Hamilton path seeking algorithm is adopted as a flight trajectory of the mobile Sink nodes; (3) the data transmission manner of the WSN is fusion-storage-forwarding; and (4) a data collection hovering point is adjusted through measuring the quality of links between the Sink nodes and sensing nodes in a real time manner. The development method has application advantages in the aspects of disaster and environment monitoring, wide animal habit monitoring, intrusion detection, safety monitoring, and the like.

The invention presents a method for transmitting information in a wireless sensor network. The method comprises the following steps: placing a mobile sink node with a fixed moving trajectory on the edge of a sensing region; equally dividing a wireless sensor network into a plurality of clusters, wherein the clusters select their respective cluster heads; connecting the cluster heads into a chain through a greedy algorithm; and selecting the cluster head nearest to the mobile sink node to send data to the mobile sink node. The energy hole phenomenon and uneven distribution of cluster heads in the prior art are overcome. The network traffic load is reduced. The life cycle of the wireless sensor network is extended greatly.

The embodiment of the invention provides a data forwarding method and a data forwarding apparatus based on clusters. The method comprises the following steps: dividing a wireless sensor network into aplurality of sub areas, wherein the sub areas comprise mobile sink nodes and a plurality of cluster head nodes; separately calculating the access paths of a plurality of mobile sink nodes to traversethe plurality of cluster head nodes in the sub areas; judging whether the access paths in the sub areas are balanced; if not, adjusting the areas of the sub areas, and executing the step of calculating the access paths; if so, determining a current distribution result of the sub areas as the partition result of the wireless sensor network; based on the determined partition result, separately calculating the access paths of the plurality of mobile sink nodes to traverse the cluster head nodes in the sub areas; and separately dispatching the plurality of mobile sink nodes to receive to-be-forwarded data according to the calculated access paths. By adoption of the data forwarding method in the embodiment of the invention, the technical problem of how to improve the instantaneity of the wireless sensor network is solved.

The invention relates to a mobile sink data acquisition method based on a binary tree inquiry in a wireless sensor network. The method comprises the steps of building a virtual regional binary tree system in a circular deployment area; calculating the serial number of the belonged area of nodes in a virtual regional binary tree according to geographic positions and building a neighbour node information sheet; moving a sink along the outmost periphery of the circular area, staying on each area of an outmost layer in the virtual regional binary tree system, broadcasting an Hello package to the same area and all father areas in a multi-hop way, notifying the position information of the sink, and naming the area for broadcasting the position information as a label area; when the data of the nodes is needed to be uploaded to the sink, inquiring the position information of the sink in the label area, and then transmitting data to the sink according to the position information of the sink stored in the label area. The energy consumed by broadcasting the position information in the whole network in the process of moving the sink can be saved, the standing time in the different areas is decided by the data volume generated in the network and the node positions for generating data packages, and the energy consumption of the nodes can be further balanced.