38results about How to "Reduce latency overhead" patented technology

The invention discloses a method and equipment for determining arrival angles of antenna arrays. The method comprises the following steps: receiving at least one training sequence transmitted by base station equipment through a receiving antenna array by mobile terminal equipment, wherein one training sequence is transmitted in each time slot, and the training sequences are transmitted after being subjected to beam forming processing by the base station equipment; combining the received at least one training sequence; estimating channel impulse responses of a transmitting antenna array of the base station equipment and the receiving antenna array of the mobile terminal equipment according to the combined training sequences; and estimating arrival angle information of the receiving antenna array of the mobile terminal equipment with the channel impulse responses. Respective arrival angles are estimated through the training sequences transmitted between the base station equipment and the mobile terminal equipment, so that the time delay overhead of angle value estimation is reduced; the method and the equipment can be suitable for a millimeter-wave system under a large scale of antenna arrays; signal transmission with a millimeter-wave band is realized; and the signal transmission efficiency is increased effectively.

The invention relates to an access authentication method of electric automobiles. The method comprises the following steps that: access authentication systems of the electric automobiles are established; access authentication between the electric automobiles and a charging station is carried out; and the charging station carries out batch signature authentication on the electric automobiles. According to the invention, identity aggregate signatures are introduced into identity validity inspection of the electric automobiles, and bidirectional authentication and session key negotiation are designed between the electric automobiles and the access authentication systems, so that the reasonable usage of the information resources in the station is ensured, and the safety of the whole network system is fundamentally ensured. The batch signature authentication mechanism enables the charging station to verify a plurality of electric automobile terminal signatures in the aggregate manner, the calculation load is lightened, and the performance is improved. The typical identity aggregate signature system is composed of five algorithms: system initialization, private key generation, signing, aggregation and aggregate verification, user identity information can be used to replace a public key thereof, the problem of high certificate cost is solved, and by compressing the plurality signatures into one, the high-efficiency verification is carried out.

The invention discloses a data consistency system based on a satellite network environment. The system comprises n gateway stations, wherein each gateway station comprises a meta-data server and is used for realizing meta-data synchronization by means of a chain-based high-consistency strategy through a transaction chain when the average speed of the chain is larger than or equal with a threshold,and otherwise, realizing meta-data synchronization by means of a chain-based low-consistency strategy through the transaction chain; a hot-standby meta-data server which is used for replacing the meta-data server for service when shutdown of the meta-data server occurs; and a data server which is used for supplying the chain-based high-consistency strategy for the writing operation of the data block in the data server when the average speed of the chain is larger than or equal with the threshold, and otherwise, supplying the chain-based low-consistency strategy. The data consistency system has advantages of ensuring high granularity consistency, realizing quick read-and-write response and reducing synchronous expenditure of repeated data.

The invention discloses a video synchronization playing method for a stakeholder viewpoint real three-dimensional display system based on a sliding window. The method includes the following implementing steps that a synchronization control terminal and video playing client sides are specified in advance, all the video playing client sides are respectively connected with the synchronization control terminal, and the synchronization control terminal is connected with a service control terminal; the synchronization control terminal judges the type of a playing control instruction, and if the control instruction is a stopping instruction, the synchronization control terminal and the video playing client sides stop outputting; if the control instruction is a playing or fast forward instruction, the synchronization control terminal and the video playing client sides respectively read a video frame into a video flowing queue, a time label of a next video frame to be played is broadcast to all the video client sides to keep the video playing client sides and the synchronization control terminal synchronous when the synchronization control terminal outputs the video frame. The video synchronization playing method has the advantages of being good in expandability, small in time delay discreteness, small in synchronization control error, good in synchronization performance, good in playing-progress-adjusting synchronization performance and high in playing-progress-adjusting synchronization speed.

The invention puts forward a dynamic repairing high-performance on-chip cache fault-tolerant framework, and can timely and efficiently process intermittent bit failure and permanent faults by low expenditure. Through a fault-sensitive replacement mechanism, new faults can be tolerated at any time, the cache is guaranteed to normally work, then, on the basis of a situation that a cache block is used and accessed, and a fault subblock is dynamically repaired to lighten an influence on the performance of the cache by faults.