47results about How to "Reduce node power consumption" patented technology

The invention relates to a wireless sensor network node, which refers to the node that can realize low power consumption, and is characterized in that the network time synchronization and calibration of all nodes and switching control on working modes between long-time dormancy and timing arousal are realized by a precise clock module. After a wireless sensor network is established, at first each node clock in the whole network is synchronized, on the basis, the precise clock module arouses the node in the long-time dormancy according to set time, responses a host computer instruction and finishes the work of data collection and transmission, then returns to the state of long-time dormancy again and waits to be aroused next time. The node of the invention is used for a wireless sensor network system, and has the advantages of remote control function, network node time synchronization, reduction on the frequent periodical arousal and dormancy of the node, saving a large amount of battery power, reducing greatly system power consumption, and the like, thus greatly increasing energy efficiency and effectively expanding the life cycle of the whole network.

The invention discloses a sensor data collecting system in urban environment, which belongs to the technical field of wireless self-organizing networks. The system of the invention comprises sensor nodes, a vehicle-mounted information transceiver, wireless access points and a data server. The sensor nodes are arranged on fixed positions in the urban environment and are used to record data in an observation zone, the wireless access points are arranged on the fixed positions in the urban environment and are connected with generated data of the data server, the vehicle-mounted information transceiver is arranged on mobile vehicles such as buses and is used to receive data which is collected by the sensor nodes through a wireless data transmission mode and to send the data to the data server through the wireless access points in the wireless data transmission mode, and the data server receives and stores the data from each wireless access point. The system enables the sensor nodes which are deployed sparsely to realize data uploading without multiple hops, the power consumption of the sensor nodes is greatly lowered, the network service life is prolonged, the cost is low, and the expandability is good.

The invention discloses a relay method and a nodal point of power line communication. The method includes judging whether the target address in a data frame is matched with the address of the nodal point or not after receiving the data frame. The data frame carries the target address, relay hopping times and sent times. If the target address in a data frame is not matched with the address of the nodal point, the method determines whether the data frame satisfies the forward condition. The transfer condition at least comprises that the data frame is not sent and the forwarded times is smaller than the relay hopping times. If the data frame satisfies the forward condition, the forwarded times in the data frame is added by 1 sequentially according to broadcast times and are broadcasted. The broadcast times is obtained by calculating the relay hopping times, the forwarded times in the data frame and the largest sending times of the nodal points, and the largest sending times is larger than the relay hopping times. The relay method and the nodal point improve successful ratio of the power line communication while not sacrificing communication time by combining repeated sending with the flooding technology.

The invention relates to an establishment method of a multi-hop wireless self-organization network applied to agriculture. The establishment method comprises the following steps: an initial network comprises a source node, a child node list and a common node, and the source node is used for sending a networking broadcast frame; the source node distributes a logical topology frame for a node which sends a networking response frame after receiving the networking response frame, the node mark which sends the networking response frame and the corresponding logical topology frame are stored in the child node list, a networking acknowledgement frame is sent to the node which sends the networking response frame, and therefore a networking accomplishment state is achieved; the node which sends the networking response frame updates a father node of the node and the logical topology frame after the networking acknowledgement frame is received; and the node which sends the networking response frame delays according to the logical topology frame of the node and carries out networking with the node as the source node till all nodes accomplish networking when the delay is finished. The establishment method can reduce overall power consumption of the network, reduce demands on hardware and quickly obtain a topological structure of the network under the condition that basic needs can be met.

The invention discloses a low-delay and low-power-consumption downlink communication mechanism based on Lora. The low-delay and low-power-consumption downlink communication mechanism comprises the following steps: S1, a Lora gateway issues a beacon frame through a service channel; Lora nodes which access the network receive beacon frames at regular time for synchronization; S2, the Lora nodes acquires information such as network beacon time, an address number under an allocated channel, a packet number, a channel radio frequency parameter and the like through the network access interaction information; and S3, calculating downlink interception reference time and an interception period according to the information obtained in the S2. The Lora chip is in the dormant state in other time periods except CAD interception and time sequence reception time periods, and an MCU is allowed to be dormant; if no other service needs to be executed, the MCU can enter a low-power-consumption mode, andtherefore power consumption of a communication module group is reduced to a great extent.

The invention relates to a sensor network positioning method based on triple-hop zone. In a wireless sensor network discrete model, the concept of zone of node communication range is established, the number of the anchor nodes which constrain the positions of the nodes is reduced within the triple-hop communication range, the overlapping area of a plurality of zone communication ranges is used as the possible area of the node positions, and the center of the area is adopted as the estimated node position. The positioning method adopts distributed computing and processing, so that the accuracy and the percentage of coverage of the positioning of unknown nodes are effectively improved, and the computation expense and the power loss of the network nodes are reduced, simultaneously, the positioning stability is guaranteed, and the anti-disturbance capacity is strong; and the positioning method has certain application value, is suitable for large-scale random network, and can effectively meet the requirement for the high-accuracy distributed positioning of the wireless sensor network.

The invention provides a household appliance ad hoc network method and system based on a BLE MESH network protocol. According to the method and the system, a BLE MESH ad hoc network is established between a household appliance embedded with a low-power-consumption Bluetooth communication module and a gateway in an ad hoc network manner; when the control end can directly communicate with the household appliance, the control end accesses the BLE MESH ad hoc network and controls the household appliance through the network; and when the control end cannot directly communicate with the household electrical appliance, the control end performs data transmission with a gateway to realize control of the household electrical appliance. According to the method and the system, the Bluetooth mesh networking system provided for the smart home has the advantages of low transmission delay, low node power consumption, low cost and the like, the Bluetooth mesh has a unique multi-hop technology and an adhoc network technology, IPs and data of a built-in non-public encryption algorithm in chips of smart home equipment and a gateway are encrypted by adopting the non-public encryption algorithm, and enough guarantee is provided for the security of the smart home.

The invention discloses a cathode protection data automatic acquisition system based on a wireless sensor network. The system is based on a radio frequency transceiver CC1110, adopts a time division multiplexing working mode, and mainly comprises a solar power supply module, a power circuit, the radio frequency transceiver CC1110, a down link and an up link, wherein the solar power supply module is connected with a radio frequency single chip processor; the input end of the radio frequency single chip processor is connected with a data acquisition module; the output end of the radio frequency single chip processor is connected with an impedance conversion circuit; the output end and the input end of the impedance conversion circuit are respectively connected with the input end and the output end of the first radio frequency switch; the output end of a first radio frequency switch is connected with the down link; the output end of the down link is connected with a second radio frequency switch; the output end of the second radio frequency switch is connected with a transceiver antenna; the other output end is connected with the up link; the up link is connected with the first radio frequency switch; a switch control output end of the radio frequency single chip processor is connected with the first radio frequency switch and the second radio frequency switch. The automatic acquisition system can implement automatic data acquisition, transmission and timed monitoring.

The present invention relates to a LIN network slave node control system, a LIN network slave node and a method. The LIN network slave node control system comprises an electronic control part, and the electronic control part comprises: a LIN signal detection, reception, and control module, a processing module connected to the LIN signal detection, reception, and control module and a LIN signal transmitting module connected to the processing module; the processing module generates, according to acquired analysis results, control signals for activating the LIN signal transmitting module, and transmits the control signals to the LIN signal detection, reception, and control module, or blocks LIN signal transmitting module and/or processing module control signals; the LIN signal detection, reception, and control module activates the processing module according to awake signals from a LIN bus, activates the LIN signal transmitting module according to the control signals from the processing module, or can block the LIN signal transmitting module and/or the processing module.

The invention relates to a self-adaptive parking space detection method based on a ZigBee technology. The method comprises the following steps of: firstly constructing a ZigBee wireless network through a coordination point, a route node and a terminal node; dividing the network into a plurality of areas according to the route node; dividing the terminal node into an environmental reference node and a common node; setting the environmental reference node on a non-parking space; setting the common node on a parking space; collecting light intensity values by a light intensity sensor connected with the terminal node; transmitting the light intensity values to the coordination point through the terminal node and the route node in sequence; judging the current environment by the coordination point according to the light intensity values of the environmental reference node and the common node; and comparing the relation between the light intensity values of the environmental reference node and the common node as well as threshold values of the current environment, and detecting whether the parking space is free. Compared with the prior art, the self-adaptive parking space detection method based on the ZigBee technology has the advantages of being strong in adaptivity and high in reliability.

The invention relates to a wireless relay sensor network optimal transmission strategy method. According to the wireless relay sensor network optimal transmission strategy method, in accordance with inspiration of a wireless sensor network technology and a relay communication technology, a distributed amplification and forwarding wireless sensor network with an amplification and forwarding relay is disclosed, sensors observe dynamic parameters in a noise environment, an observation result is amplified and forwarded to the relay, the relay amplifies and forwards received observed values to an FC (fusion center), and the FC carries out parameter tracking at a kalman filter by the observed values; and the problem how to find the optimal gain of sensor transmission and minimize total power and independent power consumption of the sensors under the constraint of an MSE (mean square error) of parameter estimation is solved.

The invention discloses a low power consumption transmission system and method for oil field data collection. The method comprises the following steps: initializing a Lora terminal and a Lora concentrator; sending, by the Lora terminal, a network access request to the Lora concentrator; judging, by the Lora concentrator, whether the Lora terminal is a new node or an old node; if the Lora terminalis the new node, performing network access authentication on the Lora terminal, registering the Lora terminal in a network route established by the Lora concentrator, and performing networking after the network access authentication is successful; if the Lora terminal is the old node, registering the Lora terminal in the network route established by the Lora concentrator, and performing networking; performing, by the Lora concentrator, time synchronization, and distributing time slices through the Lora terminal, and then entering a sleep state; and obtaining, by the Lora terminal, the time slices, entering the sleep state and periodically waking up to report uplink data. According to the low power consumption transmission system and method disclosed by the invention, the collection, transmission and processing of oil field data are achieved by a wireless sensor network of a component of the Lora concentrator and the Lora terminal, the low power consumption transmission system and method are suitable for the application demands of numerous oil field points and large distance, the node power consumption is reduced, and the networking, deployment and maintenance costs are reduced.

The invention provides a wireless link networking method based on node address. The wireless link networking method is applied to a network by cascading a master node and at least one slave node, andcomprises the following steps: configuring a unique address for each of master node Mo and sub-node Ai (Ai belongs to 1, N+), and defining an addressing filler; sending an addressing frame for the sub-node AN to the sub-node through the master node, wherein the addressing frame at least comprises the address of the master node Mo, the address of the sub-node AN, and the addressing fill character;adding the address information of the sub-node Ai to the addressing filler after the sub-node Ai receives the addressing frame sent by the last node, and then continuously sending the addressing frameto the next sub-node; adding the address of the sub-node AN to the addressing filler after the addressing frame arrives the sub-node AN, and sending the addressing frame response to the master node Mo, wherein the maser node Mo stores the path data to the sub-node AN from the master node Mo in the addressing frame.

The invention discloses a design method for separating a computing function and a management function of a server. The method comprises the following steps of separating interfaces between computing function entities and management function entities of the server from physics, and realizing all management function entities on an independent single board or device to form a management function resource pool; connecting the management function resource pool and each computing function entity through an outer cable or a backboard bus, and dynamically distributing and flexibly customizing the corresponding relationship between each management function entity in the management function resource pool and each computing function entity under the operation and maintenance background, wherein the management function entities comprise BMC (baseboard management controller), SMC (shelf management controller) and RMC (rack management controller). The design method has the advantages that by compounding the BMC/SMC/RMC functions, the system cost is reduced, and the working efficiency of node management is improved; by integrating the management, monitoring and configuration, the networking between an equipment foreground and an operation and maintenance background is simplified, and the number of PC (personal computers) of the operation and maintenance background is reduced.

The invention relates to an ultra-lightweight encryption method suitable for WBAN data real-time encryption transmission, and belongs to the technical field of wireless communication. According to the method, the random number extracted from the physical layer protocol data in the body area network protocol is introduced as the key parameter, and the private key is generated after the key parameter passes through the MD5 function to encrypt the key, so that the confidentiality of key transmission in asymmetric encryption is enhanced. According to the method, the problem that the secret key of the wireless body area network is acquired maliciously can be effectively prevented. Meanwhile, a secure channel is established through identity authentication, the transmission safety of the ciphertext in the channel is guaranteed, the node power consumption is greatly reduced, and the service life of a node battery is prolonged.

A wireless sensor network transmission method belongs to the field of wireless sensor network technology. The method comprises that a radio frequency circuit receives address confirmation packets and transmits data; a central processing unit is used for selecting wireless sensor network nodes and controlling the sleep time of the wireless network sensors; an FPGA (field programmable gate array) chip compares target addresses inside the address confirmation packets with the addresses of the wireless sensor network nodes. Compared with the prior art, the wireless sensor network transmission method has the advantages that, through single-frequency-range operation, next-step addresses are selected from multiple wireless sensor network addresses preset in the central processing unit for direct data transmission, so that efficient data transmission can be achieved, and a function of reducing power consumption of the nodes can be obtained.