62 results about "Sleep scheduling" patented technology

This invention relates to a method of flowing of wireless sensor networks Adaptive Channel Access control, being the same with multi-hop wireless sensor networks. When the network initializes, at first synchronization formed virtual cluster between nodes, each node adopting cyclical interception sleep mechanism to reduce the consumption of energy nodes as much as possible in the state. In the same virtual cluster, remained an interception sleep scheduling between the nodes, started interception at the same time. Sending and receiving data between nodes adopt RTS / CTS / DATA / ACK mechanism for reliable transmission, but also according to its own queue in the packet predict the number of network traffic changes, adaptive duty cycle adjust, reduce packet transmission time. At the same time, Interception is adopted adaptive mechanism to reduce wait delay because of node sleep. The invention of the method in different network traffic circumstances can be lower latency, power consumption and throughput performance has also been some improvement.

The invention relates to a distributed data transmission method for a power line monitoring system on the basis of a wireless sensor network, which comprises the following steps: 1, a sensor node uses T as a work cycle and on an initiation phase of each cycle and carries out time synchronization with a sink by capturing a beacon; 2, the sensor node exchanges node information with a neighbor by broadcasting so as to determine a node which needs to be subjected to data transmission in the cycle; 3, by sending the communication accessibility and local network energy load balancing between the nodes, a relay node is selected as a relay for data transmission in a distributed mode; 4, the relay node selection phase is initiated and a sensor node without data transmission in the cycle is selected as the relay node; 5, a node which needs to be awakened at the data transmission node is processed in a distributed mode; and 6, a step-shaped data uploading link is adopted to carry out awakening / sleeping scheduling on the node. The distributed data transmission method is applicable to a chain multi-hop network and energy load balancing of the power line monitoring system on the basis of the wireless sensor network.

The invention discloses a target-node-location-oriented dynamic sleep scheduling method in wireless sensor networks. The method comprises the steps of: creating a location tree, picking up wakeup anchor nodes and sleep anchor nodes from the location tree; then notifying the surrounding anchor nodes of the target node of a work mode, so that the target node can effectively keep high anchor node connectivity by dynamic sleep scheduling, location success rate and precision of the target node in wireless sensor networks is guaranteed. The massage passing mechanism is dispatching WAKEUP_MSG massage to anchor nodes in the wakeup nodes collection, to keep the wakeup state and enter a full-attendance working way; and dispatching PRUNE_MSG massage to anchor nodes in the sleep anchor nodes collection, to switch to sleep state and enter a low-consumption working way.

The invention discloses an S-MAC (Sensor-Media Access Control)-based defense method for sleep attack rejection in a wireless sensor network, wherein a node of a WSN (Wireless Sensor Network) authenticates a received synchronous capsule at a MAC (Media Access Control) layer so as to check whether the synchronous capsule is a normal synchronous capsule or not, if so, the sleep scheduling of the node is updated according to an S-MAC rule, and if not, the received synchronous capsule is rejected. After the defense method is applied to a network S-MAC (Sensor-Media Access Control) protocol, defense can be implemented. The S-MAC-based defense method comprises the concrete steps of: firstly, determining a maximum value TB and a minimum value TS of a sleep time domain in the normal synchronous capsule, judging that the synchronous capsule is normal when the received synchronous capsule meets the conditions that Ti is not smaller than TS and not more than TB, or else, discarding the synchronous capsule as an abnormal synchronous capsule. TS refers to a difference between a time interval Tdata for the node, determined by the WSN, to process data and a time interval TSYN for the node to process the synchronous capsule, and TB is the sum of the two time intervals. After the defense method is applied to the S-MAC protocol of the WSN, automatic defense can be implemented automatically. The defense method disclosed by the invention is simple in authentication rules and low in energy consumption, and can be used for effectively defending attacks and saving energy according to S-MAC without direction operation of a user.

The invention discloses an underwater source node position privacy protection method based on a virtual cube. The method is divided into three stages: in the first stage, an underwater node sleep scheduling mechanism based on geographic position information is proposed, and virtual cube division is performed on an underwater network, so that half of underwater nodes are in a sleep state, and energy is saved; in the second stage, a cloud generation and updating mechanism based on a virtual cube is provided, irregular dynamic clouds are generated around the source node to hide the position, andthe size and the position of the clouds can be updated along with the event in real time when the event moves; in the third stage, an underwater data packet secure transmission scheme is provided, a source node selects different relay nodes for data transmission to improve the node utilization rate, and a plurality of false clouds are selected outside the clouds to confuse attackers. The method can adapt to an underwater three-dimensional environment, considers node and event movement influences caused by underwater water flow factors, improves the utilization rate of energy in the network while protecting the position privacy of the source node, and prolongs the service life of the network.

The invention discloses a target-node-location-oriented dynamic sleep scheduling method in wireless sensor networks. The method comprises the steps of: creating a location tree, picking up wakeup anchor nodes and sleep anchor nodes from the location tree; then notifying the surrounding anchor nodes of the target node of a work mode, so that the target node can effectively keep high anchor node connectivity by dynamic sleep scheduling, location success rate and precision of the target node in wireless sensor networks is guaranteed. The massage passing mechanism is dispatching WAKEUP_MSG massage to anchor nodes in the wakeup nodes collection, to keep the wakeup state and enter a full-attendance working way; and dispatching PRUNE_MSG massage to anchor nodes in the sleep anchor nodes collection, to switch to sleep state and enter a low-consumption working way.

The invention discloses a device for monitoring and managing sleep quality and promoting sleep. The device comprises a hand monitoring unit and a pillow monitoring unit. The hand monitoring unit evaluates the specific sleeping condition of a monitored person and starts a corresponding preset hand perceptual mode by acquiring and analyzing the pulse information, the heart rate information, the motion information, the oxyhemoglobin saturation information, the regular exercise amount and the sleeping posture information of the monitored person, the temperature information of the environment where the monitored person is located, and the brightness information of the sleeping environment. The pillow monitoring unit acquires all the information of the monitored person, and starts a corresponding preset pillow vibration mode. The device has the advantages of being capable of promoting sleep, precise in data, safe, environment-friendly, multifunctional, small, portable and the like. The device can conduct multi-dimensional monitoring on multiple indexes like sleep quality, exercise amount and basal metabolic rate, can dynamically and intelligently conduct individualized guidance and management on sleeping plans according to sleeping parameters acquired through previous multi-dimensional monitoring, and can be applied to the normal sleep population, the insomnia population, the sleep apnea-syndrome population and the population with a snoring history but not diagnosed as sleep apnea-syndrome yet.

The invention discloses a coverage maintenance method based on sleep scheduling and coverage compensation. Specifically, the two methods of sleep scheduling and coverage compensation are adopted in the scheduling mechanism, thereby achieving the dual goals of efficient energy utilization and coverage maintenance. Firstly, the node judges whether it needs the surrounding neighbor nodes to move to it by estimating its own redundancy and remaining energy; the concept of absolute redundant node and relative redundant node is proposed for the first time; then the neighbor node judges whether it has the ability to move to the target The ability of location; by using the energy model for energy prediction to accurately judge the mobility of nodes, and then achieve the goal of maintaining coverage, and then adopt a sleep scheduling mechanism to avoid the waste of redundant node energy and achieve high-efficiency energy utilization The goal.