36results about How to "Reduce the number of exchanges" patented technology

The invention relates to a hierarchical wireless sensor network time synchronization method and belongs to a wireless sensor network time synchronization method. The method respectively adopts different synchronization mechanisms aiming at response nodes and ordinary non-response sub nodes and adopts different estimation methods to calculate the clock offset and the clock frequency offset relative to reference nodes; the hierarchical time synchronization method is divided into two stages, namely a hierarchical discovery and sub node collection stage and a time synchronization stage, wherein during the hierarchical discovery and sub node collection stage, a hierarchical structure of a wireless sensor network is established, and the response nodes on each layer are determined through collecting sub node information; during the time synchronization stage, a maximum likelihood estimation method and a least square method are utilized for calculating the clock offset and the frequency offset between the sub nodes and the reference nodes, a clock is further compensated, and by parity of reasoning, the synchronization within a whole network range is finally achieved. The hierarchical wireless sensor network time synchronization method has the advantages that the synchronous message overhead is reduced, and the energy consumption is reduced; the time synchronization accuracy is improved; the expandability is enlarged on aspect of new node addition.

The invention provides an equipment connection method, electronic equipment and a computer readable storage equipment. The method comprises the steps of obtaining historical connection records with other equipments; acquiring historical parameter information from the historical connection record; generating current parameter information according to the historical parameter information and dynamicparameter information corresponding to the current connection request; and establishing connection with the other equipment by utilizing the parameter information of this time. According to the method, the electronic equipment establishes the Bluetooth connection with other equipment according to the dynamic parameter information and the historical parameter information, and the electronic equipment uses the pre-recorded historical parameter information to reduce the number of times of information exchange with other equipment, so that the Bluetooth connection speed is increased, and the efficiency of using the Bluetooth function by a user is improved.

The invention discloses an electronic business auction method. The method comprises the following steps of: acquiring and storing auction information carried by an auction request, wherein, the auction information at least includes bidding; acquiring original price of a commodity when commodity auction is finished; generating stochastic price according to the original price of the auctioned commodity; and acquiring the stored offered price of the commodity, comparing the offered price with the stochastic price, and selecting a buyer successful in auction. An electronic business auction device is correspondingly provided in the embodiment of the invention. The electronic business auction method and the device improve participation of buyers, increase interest of auction process, and activate atmosphere of electronic business systems, simplify user operation process, reduce man-machine exchange times, and improve processing efficiency of the system.

The invention discloses a fan-shaped train position-fairness-based wave beam transmission method applied to high-speed-rail wireless-communication. The method comprises the steps of: establishing a fan-shaped wave beam structure, and covering a railway by a base station through the N wave beams; using position information of a train to maximize average receiving power in a wave beam range, satisfying instantaneous receiving power stability of a train at different positions in the wave beams, and carrying out wave beam optimization on a scene of the train; for a scene where two trains meet, satisfying instantaneous receiving SINR stability of each train through maximizing a total transmission rate, and optimizing wave beam pairs; and carrying out offline calculation and storage on the wavebeams in all the scenes, and selecting a wave beam by the base station according to position information of a train for data transmission. The invention provides the wave beam transmission method, which is for high-speed-rail communication and about position-fairness, through fan-shaped wave beam coverage on a coverage area of the base station for covering the wave beams of a wider range, and impacts brought by Doppler frequency shift and path loss changes are overcome.