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

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 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 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 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.