50results about How to "Reduce node energy consumption" patented technology

The invention discloses an efficient routing method of a high rate-wireless personal area network (HR-WPAN) mesh network and relates to routing technology based on topology servers in the WPAN mesh network. According to the routing method, broadcasting Link State Registration information, converging the Link State Registration information, shortening the length of relay node lists, releasing optimal path information through self-adaptive routing and a routing mechanism based on node dump energy are adopted, and the problems that the unicast control information of an existing routing method of the WPAN Mesh network based on the topology servers can not release network topology information sufficiently, the number, the content and the forwarding path of the control information are redundant, node energy is not considered in a routing process under the multi-path conditions and the like are solved. Control overload is reduced, path constructing time is shortened, node energy consumption is balanced, network bandwidth is saved, the efficiency of the routing method and the performance including time delay and the like are improved, and service life of the network is prolonged.

The invention discloses a topology control system and a corresponding topology control method suitable for dynamic networks, which mainly solve the problem of performance degradation when the existing network topology control systems and methods are used in dynamic networks, including a perception module and a data processing module , a data judging module, a communication module and a central module. The sensing module, data judging module, and communication module are respectively connected to the data processing module by wire, and the communication module is connected to the central module wirelessly; the sensing module collects the data of surrounding nodes, transmits them to the data processing module for caching, and selects the cluster head of the current node according to the data. It is transmitted to the data judgment module; after the data judgment module checks that the cluster head is qualified, the communication module is responsible for wirelessly transmitting the cluster head information to the central module; the central module summarizes the data of all nodes in the network and transmits the result to the client. The invention can improve the stability of the dynamic network and can be used for topology control of the dynamic network.

Provided is a method for improving mobile sensor network coverage rate. A mobile sensor network that the method is based on comprises a plurality of heterogeneous mobile sensor nodes, wherein each mobile sensor node has a specific perception radius and a communication radius and can obtain position of itself. The method comprises: meshing the continuous mobile sensor network monitor area and distributing each mobile sensor node to the meshed monitor area randomly so that initial position of the each mobile sensor node is obtained; calculating coverage rate of the mobile sensor network; determining strategy of improving mobile sensor network coverage rate by employing coverage hole-directed distributed differential evolution algorithm (CHDDE), that is, determining the position where each sensor node is to move; and carrying out the movement operation for each mobile sensor node. The method is more comprehensive and practical with the rate of convergence and system energy consumption taken into account; besides, based on distributed computation of node, and through coverage hole-directed distributed differential evolution algorithm, the new position of the node is calculated without foreknowing position information of all nodes, so that calculating speed is quickened and communication cost is saved, node energy consumption is saved, and network lifetime is prolonged.

The invention provides a double-hop cooperative transporting method based on physical-layer network coding, which comprises the following steps of: each MS adds a CPI with a proper length on an OFDM signal to be transmitted when each MS transmits a first transmission signal to a selected RS, and respectively and simultaneously transmits to the RS; and the RS firstly eliminates the CP1 from the received multi-channel OPDM signal to remove a first time error existed in the system, emerges with a PNC, adds the CP2 with the proper length on the emerged signal when the RS transmits a second signalto a BS, and transmits the signal to the BS so as to help the MS to transmit the information. The BS delimitates the CP2 from the received and emerged signal to remove a second time error existed in the system, and indirectly obtains the required information by means of PNC decoding. Therefore, even if the uplink from one MS to the BS is interrupted, the BS also can obtain the transmitted information, so that the method improves the network transmission quality.