5 results about "Ubiquitous network" patented technology

This invention provides a ubiquitous network frequency offset estimation method, system, medium, and terminal. The method includes the following steps: receiving wireless signals from multiple carriers of multiple satellites; constructing the satellite-to-ground geometric relationship between each satellite and the terminal; constructing a frequency offset estimation equation based on the wireless signals and the satellite-to-ground geometric relationship; and obtaining a frequency offset estimate based on the frequency offset estimation equation. The ubiquitous network frequency offset estimation method, system, medium, and terminal of this invention can achieve accurate frequency offset estimation even in the absence of GNSS signals in the ubiquitous network, thereby ensuring the continuity and reliability of the ubiquitous network.

The present application relates to the technical field of network communication congestion control, in particular to an end-network cooperative ubiquitous network congestion control method. The method is applied to a ubiquitous network comprising end nodes, intermediate nodes and content production nodes. The end nodes generate and send interest packets. The intermediate nodes obtain queue usage state, pending interest table occupation state, available bandwidth state and interest packet satisfaction state when the data packets return, generate a first congestion score or a second congestion score, and generate a congestion marking probability in combination with the occupation contribution of the target interest flow in the pending interest table to mark the return data packets with congestion. The intermediate nodes perform interest flow splitting or rate shaping according to the congestion level, and the end nodes adjust the subsequent interest packet sending window according to the congestion score information and the congestion marking result. The present application is suitable for high dynamic and multi-path ubiquitous network congestion control.

Provided in the present invention are a frequency offset estimation method for a ubiquitous network, and a system, a medium and a terminal. The method comprises the following steps: receiving radio signals of a plurality of carriers from a plurality of satellites; constructing a satellite-to-ground geometric relationship between each satellite and a terminal; on the basis of the radio signals and the satellite-to-ground geometric relationship, constructing a frequency offset estimation equation; and on the basis of the frequency offset estimation equation, acquiring a frequency offset estimation value. The frequency offset estimation method for a ubiquitous network, the system, the medium and the terminal in the present invention can realize accurate frequency offset estimation when a ubiquitous network lacks GNSS signals, thereby ensuring the continuity and reliability of the ubiquitous network.

The invention provides a frequency offset estimation method and system for a ubiquitous network, a medium and a terminal, which support specific uplink frequency offset pre-compensation based on the terminal in an elastic GNSS (Global Navigation Satellite System) scene. The support of each terminal for pre-compensating the specific uplink frequency offset of each terminal based on the terminal specific uplink frequency offset pre-compensation means that the terminal realizes the separation estimation of two frequency offset parameters of Doppler frequency shift and crystal oscillator frequency offset based on a given method, and further calculates the specific uplink frequency offset value of the terminal. Pre-compensation is carried out before uplink transmission. The frequency offset estimation method comprises the following steps: receiving a plurality of reference signals from a network node; calculating a downlink total frequency offset corresponding to the network node based on the reference signal; and constructing a frequency offset estimation equation set based on the downlink total frequency offset and ephemeris information, and estimating a plurality of frequency offset parameters. According to the ubiquitous network-oriented frequency offset estimation method and system, the medium and the terminal, uplink frequency offset estimation of the terminal side can be effectively realized in an elastic GNSS scene.

The application relates to the technical field of privacy data protection, and discloses a ubiquitous network multi-modal privacy data protection method, which comprises the following steps: a client performs band pass filtering, standardization and sliding window slicing pretreatment on multi-modal physiological signals such as electroencephalogram, electrooculogram and electromyogram; frequency band discriminant features are extracted and fused from the obtained time sequence data window according to a preset frequency band; model training is performed locally, and a parameter update difference value is calculated, and differential privacy noise is injected; a non-interactive zero-knowledge proof is generated based on the Groth16 protocol, and the noisy difference value and the proof are uploaded to a trusted third party; after verification by the trusted third party, the difference value is confused and forwarded to a central server; and the central server aggregates and updates a global model according to sample weights and distributes the global model to the client. The method realizes efficient cooperation of multi-modal signal end-side adaptive fusion and distributed privacy protection, and guarantees the safety and credibility of parameter interaction through a non-interactive proof mechanism.