37results about How to "Improve the success rate of data transmission" patented technology

The invention discloses a method for acquiring information of a wireless sensor network assisted by a mobile terminal. The network of the invention works in a fixed-and-mobile mixed mode. A data acquisition mode is either reporting at regular time or referring according to requirement. One or a plurality of fixed sink nodes are in the network, which are responsible for interest distribution, information acquisition and access into an upper-level network. All sensor nodes are maintained to the reliable transmission routes of the fixed sink nodes. When sensor nodes have data needing to be reported: if no mobile terminal exists in the network, the data is transmitted to the fixed sink nodes by multi-hopping; if one to a plurality of mobile terminals exist in the network, the sensor nodes transmit the data to the nearest mobile terminal or the fixed sink nodes by multi-hopping. The mobile terminals only diffuse the location updating thereof to the nodes within a small range close to the mobile terminals. The sensor nodes receiving the location updating information from the mobile terminals are maintained to the routes of the mobile terminals. The method of the invention can solve the current communication bottleneck problem near the sink nodes of the large-scale fixed sensor network by utilizing the existing commercial high-speed mobile network in an auxiliary way, improve the capacity of the network, prolong the survival time of the network and reduce information acquisition delay. The method of the invention has relatively high reliability, flexibility and expandability.

An automatic frequency hopping method is provided for use with a wireless device. The wireless device could transmit data in two or more communication frequency bands. According to the counts of successful data transmission in respective communication frequency bands, the reasons of communication failure are analyzed. According to the reasons of communication failure, the automatic frequency hopping method discriminates whether a frequency hopping procedure is performed. Since the frequency hopping procedure is performed when a proper frequency hopping condition is satisfied, the automatic frequency hopping method could achieve the power-saving purpose and avoid the wireless communication interference with other wireless devices.

The invention discloses a method for upgrading equipment in a mesh network, which includes the following process: the first node to be upgraded sends its corresponding Wi-Fi information element to the surrounding nodes of the first node, and the Wi-Fi information element contains the first The device type information of the node and the firmware version information required for upgrading; the first node listens to the information sent by the surrounding nodes when communicating with it, and obtains the respective device types, firmware version information and signal strength of the surrounding nodes during communication; the first node communicates with the surrounding nodes All the matching surrounding nodes choose to send an upgrade request to the node with the best signal strength to obtain the required firmware information and upgrade. The present invention is applicable to the situation that the device regularly visits the external device to inquire about the new firmware and chooses to upgrade, and the upgrade is the situation where the external device actively pushes new firmware information to the device, and the new firmware can be obtained nearby, saving time; and the device with a strong signal strength can also be selected Request firmware, data transmission success rate is high, the transmission rate is fast and not easy to break.

This invention relates to vehicle mounted CAN bus fiber concentrator and to a serial communication device between car inner devices. It comprises N pieces of plastic sending and receiving and lossless arbitration circuit 1 and signal exchanging circuit II. The light signals sent from the plastic fiber is converted into electric signals through plastic fiber receiving circuit and computes through the photoelectricity receiving circuit related line and logic diode and then are converted into electric signals suitable to the plastic fiber sending circuit through signal conversion circuit. Finally the electric signals are converted into light signals through fiber sending circuit to realize the CAN bus plastic fiber transmission.

The invention discloses a mobile Sink data collection method based on an energy balance tree, which aims to construct a network-wide data collection tree with minimum cost, and on this basis, dividesthe tree into several data collection sub-trees with similar scales and small energy consumption differences, and regards the sub-tree root as a traversal node. At the same time, the roles of the partial traversal node and the relay node are adjusted for further reduce the communication energy consumption and delay. The method provided by the invention shows obvious advantages in terms of the length of the moving path, the success rate of data transmission, the lifetime of the network, etc., and improves the working efficiency of the whole network.

The invention proposes a method for coexistence of weakly trusted nodes based on a trust model of a reporting mechanism and a Markov prediction method. Based on the general trust model, this mechanism introduces a reporting mechanism to report the trust value of nodes to form a node trust degree. According to the trust degree threshold, after excluding trusted nodes and untrustworthy nodes, weakly trusted nodes are screened out. Then use the Markov prediction model to predict the behavior trend of the weakly trusted nodes, form the node coexistence degree, and judge whether the node can coexist and participate in routing transmission, so as to improve the communication flow of the network.