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

The invention relates to a wireless sensor network protocol based on institute of electrical and electronic engineers (IEEE) 802.15.4. A central coordinator and at least one terminal node form a star network, each terminal node establishes connection with the central coordinator through a single hop to realize dual-way transmission of wireless data, each terminal node and the central coordinator are in line with a communication protocol, a communicated superframe comprises a plurality of time slots with equal set time, a first time slot when the superframe starts is a beacon frame when the central coordinator starts to broadcast to outside, time synchronization among the terminal nodes in a network is realized by monitoring the beacon frame, thereafter the terminal nodes realize dual-way communication with the central coordinator in two pre-distributed adjacent time slots according to a time sequence, the terminal nodes are in dormant and waiting states after communication and wait for being woken by an initial beacon frame of the central coordinator. The wireless sensor network protocol has the advantages of simple structure, dual-way data transmission, high reliability, determined communication time and the like, the packet transmission rate is high, and the power consumption of the nodes is low.

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 relates to a detection method for forecasting fruit maturity based on fruit skin color and environmental temperature. According to the method, an intelligent color sensing module and an integrated temperature sensor based on the chip of a wireless singlechip CC2430 are installed in a fruit tree for comprehensive detection and judge of the fruit maturity. Onsite measuring sensor networking is carried out through a Zigbee module and monitoring data low power consumption wireless transmission is realized. A frequency signal outputted from the color sensor is subjected to signal conditioning, digitization and parameter correction so as to obtain a RGB parameter of the fruit surface color. An analog signal outputted from the temperature sensor undergoes AD conversion and filtering correction and then is used as a factor for judging the fruit maturing trend. The above parameters undergo multi-sensor data fusion and analysis and then the fruit maturity can be evaluated and simultaneously the fruit maturing speed can be forecasted. The method can be used for remote and nondestructive detection of fruit maturity. Therefore, managers can master fruit harvest time flexibly, thus minimizing economic loss of orchard workers.

The invention discloses an anti-collision data transmission method for a wireless passive radio-frequency sensing system. The wireless passive radio-frequency sensing system mainly comprises a single reader and a plurality of sensor nodes, wherein node response adopts the mode of single-bit response of address codes. Compared with a binary tree and a corrective method thereof, the nodes do not need to transmit a large quantity of address codes, so that the error rate of the address codes can be effectively reduced; and the single-bit response mode adopts a breakpoint-based method, not only completes identification of all the nodes within a cycle but also can read the sensor measurement value when simultaneously inquiring the nodes, realizes the function of completion of reading of measurement values of all the sensor nodes and detection of address collision through a single query instruction, and has high efficiency. The anti-collision data transmission method for the wireless passive radio-frequency sensing system reduces the response digit of a responder and the error rate, and realizes the function of completion of reading of the measurement values of all the sensor nodes and detection of address collision through the single query instruction.

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 provides an indoor ultrasonic positioning method and system based on network level clock synchronization. Network traffic can be reduced, network loads and node power consumption can be reduced, the life cycle of a whole network can be prolonged, and positioning precision of the whole network can be improved. The method includes the steps that position information of base station nodes in the network is acquired; a positioning node is added into the network, and distances between the positioning node and the at least three base station nodes are measured through an ultrasonic ranging method of network level clock synchronization; measured distance information is processed through cooperation with the positioning information of the at least three base station nodes, and position information of the positioning node is determined. The indoor ultrasonic positioning method and system based on network level clock synchronization are applicable to the technical field of wireless sensor network positioning.

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 provides a vehicle information wireless collection method based on an Internet of Vehicles. The method comprises the steps of establishing a vehicle internal wireless sensor network between a terminal sensor node and a WSN coordinator through IEEE 802.15.4 wireless communication; the WSN coordinator receives data information sent by the terminal sensor node through a wireless network and transmits the data information to a monitoring master platform through a serial port, thereby finishing collecting and transmitting internal signals of a motor vehicle. According to the vehicle information wireless collection method based on the Internet of Vehicles, the reliability and timeliness in the wireless transmission process of the data are improved; the power consumption of the node is reduced; the life cycle of the network is prolonged; and reliable wireless data transmission is realized under a complicated electromagnetic environment in the vehicle.

The invention discloses a wireless sensor network gateway device for monitoring field crop growth information, which comprises a coordinator module, a remote access module, a management control module and power modules, wherein the coordinator module is used for operating a wireless ZigBee module drive and a ZigBee protocol, and managing a wireless plant growth information acquisition network; the remote access module is used for operating a GPRS (General Packet Radio Service) module drive and a TCP (Transmission Control Protocol), and managing remote access; and the management control module has a fan self-opening and cooling function, so that an application environment of a gateway is broadened, the working stability of the gateway is improved, and the plant growth information is acquired and transmitted continuously, quickly, reliably and stably in real time in open farmland and a high-temperature environment. The invention further discloses a wireless sensor network gateway transmission method for monitoring the field crop growth information, which acquires and transmits the plant growth information for a long time in an environment that an outdoor field is insufficient in power supply facility.

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 discloses an emergency communication-based AODV route stability algorithm improvement method. The method relates to the measurement of the reference value of link stability in an AODV protocol and route finding according to the link stability. The method includes the following steps that: link stability is calculated according to the time intervals of received HELLO messages; the link stability of a next-hop node is added into an RREQ message; all available routes are searched in a route hop count permissible range; and a route with maximum routing stability is selected to reply a RREP message to a source node. With the emergency communication-based AODV route stability algorithm improvement method of the technical scheme of the invention adopted, effective connection time of the routes of a Hoc Ad network can be improved, and the power consumption of network nodes can be reduced, and stable communication service quality can be achieved.

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 relates to a wireless communication switching system and method based on a MiWi or ANT+ interoperation technology. The system is connected through at least one mobile terminal receiving-transmitting module, a node router, a transmitting device, a sensing node and a server switch, and is used for feeding corresponding information to a corresponding mobile terminal receiving-transmitting module, so that the technical problems of greater convenience and higher rapidness for data access of a mobile data service terminal and high node energy consumption are solved, the node power consumption of the node router is lowered more importantly while data access of the mobile data service terminal is more convenient and rapider, and real-time exchange of distance information through a light rail or walking to an airport can be realized through technical coverage such as ANT+, MIWI and the like.

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 campus safety supervision system based on Zigbee and AGPS technologies, and belongs to the technical field of campus safety supervision. The campus safety supervision systemcomprises a positioning terminal, a Zigbee positioning network, a data processing server, a student management database and an upper computer terminal. In the present invention, the positioning terminal carried by the student comprises a Zigbee positioning module and an AGPS positioning module. The Zigbee nodes are low in power consumption, long in transmission distance and easy to arrange, positioning data can be uploaded to a server through an ad hoc network, the Zigbee nodes and the AGPS positioning technology are mutually fused so that the positioning precision can be improved, and then indoor and outdoor comprehensive positioning is achieved. The upper computer terminal is used for displaying the position information of the students in real time, the positions of the students can be rapidly determined when emergencies and dangers happen, and the safety of the students is guaranteed. The non-contact wireless automatic attendance mode of the system can save roll call time before class, automatically counts attendance records of students, is more flexible, and has higher use value.

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.

The invention provides a tire pressure monitoring method based on a wireless sensor. The method comprises the following steps that a tire pressure sensor module collects tire pressure information in a vehicle and sends the tire pressure information to a WSN (Wireless Sensor Network) coordinator through a router; and after the tire pressure sensor module receives a wake-up command of the WSN coordinator, the tire pressure sensor module detects receiving data immediately, stores measured values after collection, encapsulates the data and sends the data to a monitoring chief platform through the WSN coordinator. According to the tire pressure monitoring method based on the wireless sensor, which is provided by the invention, the reliability and the real-time performance of the data in a wireless transmission process are enhanced, the node power consumption is reduced, the network lifetime is prolonged, and the reliable wireless data transmission is finally realized under the complicated electromagnetic environment in the vehicle.