73 results about "Energy constrained" patented technology

An energy constrained device (100) includes a motion sensor (150) operative to detect motion of the device (100); a device position determinator (130); and a controller (110) operatively coupled at the motion sensor (150) and to the device position determinator (130) and operative to receive a device location request for the energy constrained device (100), to determine whether the energy constrained device (100) has moved based on the motion sensor (150), and to determine whether to request position information from the device position determinator (130) based on device movement. A method for saving power for a device position determinator (130) in a energy constrained device (100) includes determining whether position information has been requested from the device position determinator (130); and if not so, automatically switching the device position determinator (130) to a low power consumption mode.

The present invention relates to a method for determining an operational channel c_op of a communication network comprising at least two potential proxies for an energy-restricted device to join the network, and a set C of radio channels, wherein an energy-restricted device is to join the network, the method comprising the following steps: —the energy-restricted device transmitting a first beacon message on a first channel succ(m−1)(c)in MAC broadcast, wherein c belongs to the set C, and switching to receiving mode on channel listen(c), wherein succ and listen is an arithmetical function, from C to C, and m is a positive integer, —the proxies receiving the beacon message sent on channel succ(m−1)(c), —the temporary master device switching its radio receiver to channel succm(c), —the energy-restricted device transmitting a second beacon message on a second channel succ(c) and switching to receiving mode on channel listen (succm(c)), —upon receipt of the second beacon, the temporary master device transmitting a response on a channel listen listen(succm(c)), 20 —the energy-restricted device receiving the beacon response on a channel listen listen(succm(c)), determining that c=c_op. The invention also relates to an energy-restricted device and a proxy device therefor.

The invention discloses a wireless energy supply full duplex relay cooperation secret transmission method and system, and the method comprises the steps of enabling a relay to receive an energy signaltransmitted by an information source, and carry out the harvesting of energy; enabling the relay to receive the information which is sent by the information source and carries the private signal, forward the information to a legal receiving end by utilizing the harvested energy, and enabling an eavesdropping user to receive the information; calculating a secrecy rate lower bound in an imperfect eavesdropping channel state according to the information received by the legal receiving end and the eavesdropping user; and constructing an optimization problem of maximizing the secrecy rate, calculating an optimal solution of the optimization problem by adopting an iterative convergence optimization method, and performing information secrecy transmission according to the optimal secrecy rate onthe basis that the obtained optimal secrecy rate meets the lower bound of the secrecy rate. According to the method, the secrecy rate is maximized under the condition that the estimation error threshold value of the eavesdropping channel is known, and compared with an existing method, the method not only considers the influence of imperfect acquisition of the state information of the eavesdroppingchannel on information security transmission, but also considers the reuse of energy-limited relay antenna resources.

The invention discloses a method for determining the position of a resonant repeater in a wireless rechargeable sensor network, which belongs to the field of node energy supplement in a wireless rechargeable sensor network. In a wireless rechargeable sensor network, a mobile charging trolley is used to supplement energy for sensor nodes. By introducing a resonant repeater, the sensor nodes can becharged in a multi-hop manner. The charging distance of the mobile trolley can be significantly extended, the delay for the nodes to wait for charging can be reduced, and the charging efficiency can be improved on the whole. In the invention, it is proposed to determine the charging position of the resonant repeater by making use of the property of the circumscribed circle of a triangle and the property of the midpoint of two nodes, and the sensor nodes in the network can be covered to the maximum with a smaller number of repeaters. The problem that the energy of the nodes in a wireless sensornetwork is limited can be solved, and the service life of the network can be prolonged.

The invention discloses a WRSN multi-mobile charger optimal scheduling method based on reinforcement learning, and belongs to the field of Internet of Things wireless rechargeable sensor networks. According to the invention, the neural network and the multi-agent reinforcement learning method are introduced into the charging path planning under the scene of multiple mobile chargers of the wireless rechargeable sensor network, and the multi-agent reinforcement learning is mainly utilized to solve the problems of efficient cooperation and optimal scheduling of the multiple mobile chargers in the wireless rechargeable sensor network. Under the condition that the energy of the mobile chargers and the sensor is limited, the charging paths of the chargers are optimized through mutual cooperation of the multiple mobile chargers, and the sensor node with the low electric quantity is charged in time. On the premise of ensuring that the sensor nodes do not die due to power shortage, the total moving path of each mobile charger is the shortest, and the charging efficiency is optimized on the whole.

The present inventors have recognized that proper utilization of reconfigurable event driven hardware may achieve optimum power conservation in energy constrained environments including a low power general purpose primary processor and one or more electronic sensors. Aspects of neurobiology and neuroscience, for example, may be utilized to provide such reconfigurable event driven hardware, thereby achieving energy-efficient continuous sensing and signature reporting in conjunction with the one or more electronic sensors while the primary processor enters a low power consumption mode. Such hardware is event driven and operates with extremely low energy requirements.

The disclosure relates to a transmission scheme for nodes in a network. More specifically, the disclosure relates to an acknowledgment scheme that minimizes energy requirements for an acknowledgment of a transmission between nodes. The disclosure describes that an energy constrained node may transmit to other nodes in a network and may only require that an acknowledgment of that transmission is received from at least one of the proximal recipients, which may or may not be the ultimate target. In order to minimize the complexity of the receiver in a node and its energy requirements, the acknowledgment scheme may employ simple on-off keying (OOK) irrespective of the modulation technique of the sending transmission. The acknowledgment comprises a series of OOK pulses sent at a specified time after receipt of the transmission. In addition, simultaneously received acknowledgments can be processed and verified without confusion.

The invention discloses a decoding device of a parallel communication channel which is applied to a radio multimedia sensing network and comprises a parallel de-interleaving machine, a zero inserting device, a parallel viterbi code converter and a serial-to-parallel converter, the idea of splitting serial data into two ways of parallel data for the decoding operation of the communication channel is adopted, compared with a decoding device of a traditional communication channel, under the same working timepiece condition, the throughput of data is improved by one time through a mode of adding the viterbi code converter by the decoding device of the communication channel of the invention, under the same data rate condition, the working timepiece of the decoding device of the communication channel of the invention can be reduced by half, according to the energy consumption calculating formula of an integrated circuit, the working energy consumption of the decoding device of the communication channel of the invention is only one-fourth percent of the traditional communication channel decoding device, and the problem of energy limitation of the radio multimedia sensing network can be effectively released.

A method and apparatus is provided to supervise a network, in which a first device supervises a network node element, and a second device partially supervises the network node element.

The invention relates to a turbulence-degraded image blind restoration method based on dark channel and Alternating Direction Method of Multipliers. The method includes the following steps: firstly on the basis of the multiple dimension theory, in each dimension, applying dark channel prior constraint on an image, applying sparse constraint and energy constrain on a point spread function, then using the coordinate descent method and conducting alternating iteration to estimate a fuzzy kernel and the image in current dimension, if the dimensions arrive at the maximum thereof, a final estimated fuzzy kernel is obtained, finally, in combination with a total variation model, using a derivative Alternating Direction Method of Multipliers to make details of the image restored quickly. According to the invention, the method, by using the dark channel prior information of a clear image as a constraint item, can help a cost function to converge to a clear solution in the iteration process, addresses the susceptibility of obtaining a fuzzy solution by using tapered prior information under the Maximum posterior probability in current blind restoration algorithm, such that the method herein can restore more image details, has less ring effect, and effectively increases restoring quality.