8results about How to "Increase overhead" patented technology

A coding efficiency increase is achieved by using a common signalization within the bitstream with regard to both activation of merging and activation of the skip mode. That is, one of the possible states of one or more syntax elements within the bitstream may signalize for a current sample set of a picture that the respective sample set is to be merged and has no prediction residual encoded and inserted into the bitstream. Alternatively speaking, a common flag may commonly signalize whether the coding parameters associated with a current sample set are to be set according to a merge candidate or to be retrieved from the bitstream, and whether the current sample set of the picture is to be reconstructed merely based on a prediction signal depending on the coding parameters associated with the current sample set, without any residual data, or to be reconstructed by refining the prediction signal depending on the coding parameters associated with the current sample set by means of residual data within the bitstream.

The invention discloses a low-earth-orbit satellite communication network routing method based on reinforcement learning, and relates to the field of low-earth-orbit satellite communication networks in 5G NTN, in particular to the low-earth-orbit satellite communication network routing method based on reinforcement learning. The objective of the invention is to solve the problem that existing reinforcement learning Q-Learning applications are mostly focused on a ground network, and the unique dynamic topology and three-dimensional space routing problems of a satellite network are not solved. The invention provides a lightweight and adaptive low earth orbit satellite communication network routing optimization method based on reinforcement learning. The method is realized through distributed Q-Learning: dynamically adapting to topological change, dynamically adapting to three-dimensional space routing, balancing link load, minimizing end-to-end delay, and reducing on-satellite computing overhead.

The invention discloses a VSAT-TDMA time delay tracking method based on decoding verification, and belongs to the technical field of satellite communication. According to the method, demodulation and signaling analysis are carried out on a main station receiving signal, a small station frame plan is generated, and a signaling initial time delay estimation value is obtained by comparing burst theoretical occurrence time with actual receiving time; receiving a small station burst signal and completing decoding verification, and reserving a preorder burst signal conforming to a set rule; differential correlation operation is carried out on the effective signal to obtain a correlation peak position, a time delay change trend is obtained through smooth fitting, a subsequent burst initial position is predicted based on the trend, a receiving window is dynamically adjusted, and time delay tracking is completed. Effective samples are screened through decoding verification, time delay extraction accuracy is improved, detection jitter is filtered out, channel time-varying characteristics are adapted, uplink access synchronization stability of the system is guaranteed, the method can be deployed in an existing satellite communication system, and communication reliability is improved.

This application discloses a method, apparatus, and medium for implementing secure socket communication within the operating system kernel, belonging to the field of computer systems and network communication technology. This method registers a new secure socket type at the socket layer of the operating system kernel and associates it with a customized set of operation functions. Applications only need to create sockets of this type and inject cryptographic parameters through standard system calls to establish a connection, thereby obtaining transparent, end-to-end automatic encrypted communication capabilities. During transmission, data is encrypted in kernel mode by calling the native crypto subsystem API through a rewritten send function and an authentication tag is attached. During reception, the rewritten receive function automatically performs decryption and integrity verification. This scheme avoids reliance on large external security libraries, improves security and performance, and decentralizes encryption / decryption, resource management, and other processes to the kernel mode, providing upper-layer applications with easy-to-use, lightweight, high-performance, and highly secure kernel-level transparent secure communication.

The application provides a privacy protection federated learning method based on a blockchain anti-poisoning attack, and belongs to the technical field of federated learning, privacy protection and blockchain technology. The technical problems of poisoning attack and malicious aggregation in the privacy protection federated learning are solved. The technical scheme comprises the following steps: S10, system global initialization; S20, local model training; S30, malicious participant identification; MO and SM cooperate to determine whether the participant has performed the normalization operation; S40, gradient ciphertext aggregation; S50, participant and MO update model. The application has the beneficial effects that the application protects the privacy of the participant model gradient by using the fully homomorphic encryption algorithm CKKS, identifies the malicious gradient in the gradient ciphertext by using the cosine similarity method, and calculates and verifies the aggregation result by using the consensus mechanism of the blockchain.

This invention discloses a method and device for constructing a cross-island heterogeneous federated learning system based on homomorphic encryption. After local training on the client, the local model is packaged and sparsified at the packet granularity. The sparsed packet data is homomorphically encrypted, and the ciphertext and mask are sent to a parameter server. The parameter server aggregates the data according to the client's ciphertext weights and sends the aggregated ciphertext global model and mask to the client. The client decrypts the global ciphertext and unpacks it to obtain the global model, and updates its local model. The client calculates and returns a sketch of its local model. By clustering the sketch, the fastest client in each cluster is selected as a participant in the next round of training, and the contribution is calculated based on the sketch to obtain the aggregation weights for the next round. The trained local model is then applied to the cross-island heterogeneous federated learning system. This invention can improve the efficiency of homomorphic encryption while protecting privacy, and simultaneously resist the negative impact of lagging on model synchronization.

Provided are a network routing anomaly detection method, system, device and medium, the method comprising: receiving detection result information comprising an actual path code sent by a network device, the actual path code being used for reflecting an actual forwarding path of a detection data packet in a target network; and if the actual path code is different from an expected path code (an expected forwarding path in a normal routing state) of the target detection service flow, respectively carrying out equipment forwarding offset detection, network segment offset detection and loop path detection on the actual forwarding path by utilizing a preset routing anomaly detection mechanism to obtain an anomaly detection result, the anomaly detection result comprises the identifier of the network equipment with the path offset, the information of the network segment with the path offset and whether the actual forwarding path comprises the loop path, so that the source tracing can be carried out on the initial network equipment with the anomaly in the target network based on the anomaly detection result. According to the embodiment of the invention, refined classification and diagnosis of path anomalies can be realized.

The application discloses a virtual RDMA device based on DPDK and a use method thereof. The virtual RDMA device based on DPDK comprises a front-end virtio-rdma device, which is used for receiving an RDMA device operation request initiated by an application program in a virtual machine, encapsulating the request as an instruction conforming to a virtio protocol, and sending the instruction to a back-end vhost-user- rdma device through a vring; and the back-end vhost-user- rdma device is used for simulating the function of a real RDMA network card, the device can acquire and analyze the instruction conforming to the virtio protocol from a circular queue vring, execute corresponding RDMA device operations, and return the operation results to the front-end virtio-rdma device through the vring. The application can get rid of the dependence on the real RDMA device, and can improve the resource utilization, system flexibility and safety.