78results about How to "Reduce communication energy consumption" patented technology

The invention relates to a federated learning method based on hierarchical tensor decomposition in edge calculation. The federated learning method comprises the steps: S1, designing an effective deepneural network sharing model at a cloud end; S2, compressing the designed sharing model according to a hierarchical tensor decomposition method to obtain a hierarchical sharing model; S3, designing aforward propagation algorithm and a reverse propagation algorithm corresponding to the hierarchical sharing model; S4, initializing the hierarchical sharing model at the cloud and issuing the hierarchical sharing model to edge nodes participating in training; S5, learning the hierarchical sharing model obtained in the step S2 by the edge nodes participating in training according to the algorithm designed in the step S3 by using the local data set; and S6, aggregating the edge models at the cloud in an average aggregation mode. According to the federated learning method, distributed training ofthe shared model is realized on the premise of protecting user privacy, and the demand for network bandwidth during distributed training is reduced, and the communication energy consumption of edge nodes is reduced.

The invention relates to a distributed self-adapting industrial wireless network energy saving method for reducing the energy consumption of nodes in industrial wireless monitoring network, belonging to industrial wireless communication technology field. The energy saving project comprises: sorting all devices in the whole wireless network into node device (ND) for acquiring and sending data, energy manager for gathering and transmitting data and managing the energy consumption of the node devices, and gateway (GW) for communicating between the wireless network users and transferring monitoring data and energy managing data. By using energy manager to control the energy consumption of each node, the method provided in the invention enable the industrial wireless network to prolong network life cycle, adjust the dormancy time of the node self-adaptingly and enlarge the information amount of wireless messages, consequently, reduces the energy consumption of nodes in industrial wireless monitoring network and furthest reduces communication energy consumption.

The invention discloses a hybrid MAC protocol method for a cluster-structure multi-carrier acoustic sensor network. The hybrid MAC protocol method comprises the following steps: fusing a scheduling type MAC protocol with a competitive type MAC protocol into a hybrid acoustic communication network MAC protocol, realizing MAC protocol dynamic switching for all nodes in the network by virtue of a global synchronization time, and classifying data with different attributes through a cross layer design thought and then transmitting. Two transmission modes of free burst IBT and active polling IPT are adopted, data messages transmitted in the two different transmission modes are periodic messages and burst messages respectively, IBT time slots and IPT time slots are alternately carried out, and the length of the free burst IBT time slots is dynamically adjustable, so that the needs of transmission for the various messages in the sensor network can be met, the communication energy consumption of the sensor network can be reduced simultaneously when the service quality of the network can be ensured.

The invention discloses a high and low sensor alternate tracking energy-saving street lamp system and a control method thereof. The high and low sensor alternate tracking energy-saving street lamp system comprises a plurality of street lamps, a street lamp control module, a wireless communication module, a wireless sensor network, a sensor control module and a central control unit; the plurality of street lamps are arranged on the bilateral sides of the road surface; the wireless sensor network comprises high sensors and low sensors which are arranged below the high sensors. According to the high and low sensor alternate tracking energy-saving street lamp system and the control method thereof, the number of front or rear lighted lamps and the lighting duration are calculated according to the movement speed and the movement direction of a moving target, a lighting data instruction is transferred between the adjacent street lamps, and accordingly the communication distance is reduced, the energy consumption is saved, and the service life of the street lamp system is fully extended due to the fact that the working mode that the high sensors and the low sensors are separated from each other is adopted to form the advantage complementation.

The invention discloses a WSNs clustering routing method under long and narrow topology. The method comprises the following steps that at a cluster head campaigning stage, the cluster head campaigningtime is set for each node according to the relative rest energy and the distance between the gathering nodes; when the time is shorter, the campaigning succeeding possibility is higher; at the cluster forming stage, the nodes select to add the cluster with the shortest distance and the greater communication radius according to the stored cluster head information; at a multi-hop path building stage, on the basis of the relative rest energy and energy expenditure index, the cluster head node builds the optimum multi-hop path based on the minimum spanning tree. The WSNs clustering routing methodunder the long and narrow topology can realize more effective data transmission at each routing stage; the network transmission efficiency and the node load balance can be improved, so that the energy consumption of each node can be balanced; the network life period can be prolonged.

The invention discloses a lightweight encryption method and system for sensor gateway nodes of a body area network. The method comprises the following steps of: acquiring perception data of a plurality of sensor nodes; calculating deviation values of all the perception data; selecting a secret key to encrypt the deviation values, obtaining encrypted encryption values, and using symbol values and the encryption values corresponding to all the sensor nodes as uploading values of the sensor nodes; carrying out replacement on the uploading values of all the sensor nodes arranged according to the node sequence by utilizing the selected replacement sequence, and obtaining replaced uploading values of all the sensor nodes; and uploading the replaced uploading values of all the sensor nodes, the selected secret key sequence and the selected replacement sequence number to a cloud-computing storage server end. The method and system disclosed by the invention have the advantages that the adopted encryption algorithm is fast in operation speed and less in power consumption, and after the encrypted data are replaced, the security is improved.

The invention discloses a pyramid device laser reflection based underwater robot three-dimensional positioning and communication device and method, and belongs to the field of positioning and communication of underwater robots. The device includes a laser transmitting end base station located on the seabed and a laser reflection end installed on the underwater robot. The laser transmitting end base station includes a first sealed cavity with a window mirror and a laser generator, a vibrating mirror system, a charge coupled camera and a transmitter processor which are arranged in the first sealed cavity. The laser reflection end includes a photosensitive receiver, a communication pyramid device and a reflection end processor. Polymer dispersed liquid crystals are fixed to outer circumference of the communication pyramid device. A positioning pyramid device array used for reflecting lasers to the charge coupled camera is arranged outside a second sealed cavity. Therefore, the two-way communication between the underwater robot and the submarine base station is realized. The device has advantages of simple structure, low power consumption, small size, high reliability and low cost.

The invention relates to a regional optimal solution algorithm for underwater moving target precise positioning, which comprises the steps that underwater sensor nodes are deployed, and location information of the nodes is acquired; an activation threshold of the nodes is set, and the nodes are enabled to initially stay at a dormant state; each dormant node periodically judges whether to turn into an activated state or not; the nodes, which stay at the activated state, send marked acoustic waves so as to carry out detection on a target; the node, whose residual energy is the highest, in the activated nodes is searched so as to act as an underwater data processing center, and the other three groups of target information are received to form a positioning equation set so as to solve the target location; a regional optimal solution algorithm is defined to solve a circumstance of intersection regions occurred in a large number of positioning equation sets appeared in reality, and an acquired optimal solution is enabled to act as the target position acquired by the positioning equation set at the moment; and the activated node returns back to the dormant state if not satisfying node activation conditions in five continuous periods. The regional optimal solution algorithm provided by the invention has the advantages of ability of improving the data utilization rate of a sensor network, high positioning precision, low energy consumption and the like.

The invention discloses a method and system for reducing energy consumption of positioning communication through bluetooth, relates to the technical field of positioning communication, and is used forsolving the problem that the energy consumption is high during positioning of a conventional terminal and passing with a service platform. The method includes steps: a bluetooth terminal is a bluetooth device arranged on a wearable device, and a bluetooth base station is arranged at a fixed position and communicates with the bluetooth terminal; the bluetooth terminal receives first information transmitted by the bluetooth base station, matches the first information with a stored information list, and determines a current position of the bluetooth terminal according to the first information when the matching is successful; and the bluetooth terminal transmits ID information so that the bluetooth base station transmits the received ID information to the service platform.

The invention provides a satellite navigation positioning auxiliary ephemeris data compression and transmission method, which comprises the following steps that: equipment judges whether locally stored ephemeris data is expired or not during positioning, and requests current ephemeris data from a server if the locally stored ephemeris data is expired, and a request message comprises timestamp information of a locally stored ephemeris; after receiving the equipment request, the server searches current ephemeris data, and finds out expired ephemeris data corresponding to the timestamp accordingto the uploaded timestamp information; subtracting all parameters of the current ephemeris from all parameters of the expired ephemeris to obtain the variable quantity of each parameter; 4 bytes are used for representing the change states of satellite numbers and 26 parameters, and 4 bytes and each parameter variable quantity which is not zero are subjected to numerical value compression and packaging to form a data stream. According to the invention, the total transmission data can be compressed to about 70% of the original transmission data only by transmitting the compressed variable quantity and adding a small amount of data to the equipment, so that the data transmission quantity and the transmission time can be effectively reduced in narrowband communication, and the communication energy consumption of the equipment is reduced.

The invention discloses a method for selecting control nodes for complex task cooperative processing in a wireless sensor network. The method comprises the following main steps: in a sensing node working area, position information of all nodes is known; sensing nodes sense a complex task and then describe and decompose the task into a plurality of subtasks; the sensing nodes broadcast messages under the condition that all nodes in the working area return respective ID (Identity) number, position information and energy information; and the sensing nodes carry out sequencing on the nodes according to an energy descending order, analyze an included angle between the two nodes and the sensing nodes, select the nodes according with conditions as control nodes and divide the working area into aplurality of working subareas according to the positions of the control nodes, wherein the quantity of the working subareas is equal to the quantity of the subtasks. The method disclosed by the invention is applied to wireless sensor network communication and can improve the complex task cooperative processing efficiency and save network energy.

The embodiment of the invention provides an unmanned aerial vehicle control method and device and control equipment. The method comprises the following steps: acquiring a to-be-detected area and a limited duration for completing a detection task, obtaining the minimum data volume corresponding to a subarea, averagely dividing the limited duration into N parts to obtain N time slots with a time slot of delta t, determining the delta t as the transmission duration corresponding to the subarea, controlling an unmanned aerial vehicle to acquire data with the minimum data volume corresponding to the subarea in the subarea, and controlling the unmanned aerial vehicle to transmit the data acquired in the subarea to a data center in real time by using the transmission duration corresponding to thesubarea. By adopting the scheme provided by the embodiment of the invention to control the unmanned aerial vehicle, communication energy consumption of the unmanned aerial vehicle can be reduced, andenergy consumption is saved for the unmanned aerial vehicle, so that the phenomenon that the unmanned aerial vehicle cannot complete a detection task within the endurance time is reduced, and detection efficiency of the unmanned aerial vehicle is improved.

The invention relates to a wireless sensor network (WSN) routing protocol, in particular to an improved multi-hop LEACH protocol based on chaotic genetic algorithm for wireless sensor networks (ICGA-LEACH) . The ICGA-LEACH considers the node residual energy, the ratio of the node residual energy to the load and the node centrality to define a cluster head election threshold function, so that the probability that nodes which are located in the center of the cluster, low in load and high in energy become cluster heads is high, therefore uniformly distributed clusters are formed, and the communication energy consumption in the clusters is reduced. In order to reduce inter-cluster communication energy consumption, a chaotic genetic algorithm is adopted to search for a globally optimal multi-hop routing path. Moreover, the cluster maintenance is carried out by adopting a self-adaptive round period, so that a large number of control messages generated by frequent clustering are reduced, andthe network energy consumption is further reduced. Therefore, the ICGA-LEACH improves the network energy efficiency while balancing the network load, and effectively prolongs the network life cycle.

Disclosed are a fault tolerant method for packet transmission of a network node and a network node, which relate to the communications technologies. A network node receives a packet segment sent by a transmit end, determines a fault-containing packet segment in the packet segment, determines a vacant position formed from a missing packet segment after data connection to a correct packet segment, and matches the fault-containing packet segment and the vacant position to form a complete packet without needing retransmission, so that efficiency of communication of a network node is improved, and energy consumption of communication of a network node is reduced.

The invention discloses NBIOT sensing equipment, a period synchronous acquisition method and device thereof and a computer readable storage medium, and the method is applied to the NBIOT sensing equipment and comprises the steps: presetting a time length in advance to carry out the time synchronization with a base station before a periodic acquisition time point of the self-walking of the NBIOT sensing equipment arrives; wherein the preset duration is less than the acquisition period; updating and determining the real duration of the machine period of the NBIOT sensing equipment according to the historical time synchronization result and the current time synchronization result; and determining the machine period number away from the period acquisition time point according to the real duration of the machine period so as to acquire data at the period acquisition time point. The real duration of the machine period of the NBIOT sensing equipment is calculated according to the time synchronization result of the NBIOT sensing equipment and the base station, so that synchronous data acquisition can be accurately realized; according to the method, a synchronization server does not need tobe arranged, the performance is stable, the communication energy consumption is low, and the method can be effectively suitable for an NBIOT network.