30results about How to "Avoid sync failures" patented technology

A generation method of a circular training sequence containing two training symbols includes: randomly growing a first information clock with the length of N, copying the last L data before the first information block as the circulation prefix of the first training symbol, forming the first information block to the information block of the second training symbol in the same length with the first information block in terms of the circulation mode, namely, the second information block, in which, the circulation mode is to shift the last d data of the first block to the start position and copy the last L data of the second block before the second block as the training prefix of the second training symbol, so that the two symbols form a circulation training sequence.

The present invention relates to a kind of time synchronization method and system for multi-viewpoint video collection, and the method of the present invention comprises the following steps: (1) use the network time protocol to synchronize the system time of all devices; Start a video acquisition program respectively; (3) the video acquisition program monitors the control command from the synchronization server; (4) the synchronization server detects the maximum round-trip time of the local area network; (5) the synchronization server adds the current system time and the maximum round-trip time of the local area network as an estimated The acquisition time is sent to each video acquisition program; (6) The video acquisition program cyclically compares the current system time with the expected acquisition time, and starts video data acquisition if it exceeds. The invention effectively avoids the synchronization failure caused by too short waiting time delay, and at the same time, can avoid the unprincipled long waiting of the video acquisition machine, and the time precision can reach millisecond level. The method of the invention can be widely used in various multi-camera-based multi-viewpoint video data collection and transmission systems.

The invention discloses an agent-based information resource directory synchronization method, comprising: deploying an information resource directory node in each organization domain, and deploying a directory synchronization agent node on a gateway server of each organization domain; when the first organization domain When data changes occur in the information resource directory node, the operation message is sent to the directory synchronization agent node, and the directory synchronization agent node sends the synchronization message to the directory synchronization agent node of the second organization domain; when the directory synchronization agent node of the second organization domain receives When synchronizing messages, judge whether to synchronize with the first organization domain according to the synchronization message; if not, the directory synchronization proxy node of the second organization domain pulls the changed information resource metadata to update the information resource directory node. By adopting the above-mentioned method, it is possible to realize the direct synchronization of the information resource directory mesh, break through the bottleneck limitations of the synchronization server performance and load in the central synchronization method, and avoid the synchronization failure problem caused by the destruction of the synchronization server.

The embodiment of the present invention provides a method and device for synchronizing video network resources to Internet terminals, which relate to the technical field of video networking. At the decompression transfer terminal, receive the Internet-of-Vision resource synchronization request sent by the Internet terminal based on the Internet protocol; the synchronization request includes: the identification of the co-translation server; the co-translation server stores a video-network resource compression package; The target co-conversion server corresponding to the co-translation server identifier forwards the Internet of Vision resource synchronization request; receives the resource compression package of each Internet of Vision corresponding to the Internet of Vision resource synchronization request returned by the target co-translation server; After receiving the resource compression package, decompress each video network resource compression package and synchronize it to the database. Synchronization failures due to long reception times can be avoided.

The invention relates to the field of wireless communication, and discloses a synchronization method and device between base stations. The method includes the steps that when the local base station reaches the search time of synchronization source base stations, whether the synchronization source base station meeting the synchronization condition exists in the adjacent base stations or not is judged; if the synchronization source base station meeting the synchronization condition exists, the synchronization source base station meeting the synchronization condition is switched into the target synchronization source base station of the next base station synchronization; when the local base station reaches the synchronization time, the local base station and the target synchronization source base station are synchronized. Through the synchronization method, synchronization failure caused by changes of a synchronization source self or influences of environmental factors can be effectively prevented, and reliability of base station synchronization is improved.

The embodiment of the invention discloses a GPS signal-based base station signal synchronization method, device, base station equipment and storage medium. The method includes: receiving a GPS signal and confirming the missing time of the GPS signal; calculating a frame offset adjustment value according to the GPS signal; calculating an adjustment average value and an average adjustment interval according to the frame offset adjustment value; judging whether the missing time is greater than a preset time threshold; If the time is less than or equal to the preset time threshold, the frame offset adjustment is performed according to the adjusted average value, the average adjustment interval, and the missing time; if the missing time is greater than the preset time threshold, the frame offset adjustment value is cyclically used for adjustment. The base station signal synchronization method based on the GPS signal provided by the present invention can perform GPS synchronization stably for a long time under a weak GPS signal, and has high synchronization precision.

The embodiment of the invention discloses a synchronization method and device. A synchronization method includes: the first terminal obtains at least two ping-pong delays between the first terminal and the second terminal; the first terminal judges whether the plurality of ping-pong delays meet channel stability conditions; if so, The first terminal estimates a channel transmission delay between the first terminal and the second terminal; the first terminal sends a synchronization control signal to the second terminal, and the synchronization control signal is used for the second terminal The two terminals perform a synchronization operation after receiving the synchronization control signal; and the first terminal performs a synchronization operation with a delay equal to the channel transmission time delay after sending the synchronization control signal. The embodiment of the present invention realizes the synchronization control between terminals by estimating the channel transmission time delay between terminals, and according to the channel transmission time delay.

The invention discloses a processing method and a system of synchronization failure in dynamic content distributing (DCD) service. A series of error status codes defined in advance are stored in a terminal. When the synchronization between the terminal and a DCD server fails, the terminal reports a corresponding error status code to the DCD server according to a failure reason; then the DCD server carries out processing according to the failure reason expressed by the error status code, and when the failure reason is an temporary error, the DCD server informs the terminal to immediately attempt synchronization so as to avoid that a synchronous process of a normal retry mechanism delays the time of data synchronization, and thereby, user experience can be influenced. Correspondingly, when the failure reason is a fatal error, the DCD server sends a fatal error message to inform the terminal to let a user terminate synchronization so as to avoid that the synchronization triggered by the retry mechanism continuously fails, and thereby, an information interactive condition between the server and a client side can be improved. Meanwhile, the invention also discloses a processing system of synchronization failure in DCD service.

The invention discloses a variable-frequency main power source ship power station, and the power station comprises prime motors ME, engines G, rectifiers, a DC busbar DC, an AC busbar AC, an inverter, and a frequency converter. There are a plurality of groups of motors ME, engines G and rectifiers. The motors ME are connected with the engines G, and drive the engines G to rotate. The engines G output electric energy to the rectifiers, and the rectifiers are connected with the DC busbar DC, and transmit the direct current to the DC busbar DC. The inverter is connected between the DC busbar DC and the AC busbar AC, enables the direct current of the DC busbar DC to be converted into the alternating current with the rated frequency, and supplies the alternating current to the AC busbar AC of the ship power station. The frequency converter is connected with the DC busbar DC, and the direct current is used for controlling variable-frequency power utilization equipment through the frequency converter after frequency conversion. The invention solves a problem of energy waste caused by the condition that the rotating speeds of prime motors ME are constant and cannot be adjusted along with the load change when the change of a power utilization load of a ship under different work conditions is bigger.

The apparatus thereof comprises a main control module and a distributing module. The method thereof includes: a) said distributing module reports a message not capable of routing by itself to said main control module; b) in term of said message, the main control module looks up ARP table; if a corresponding list item is found, and then synchronizing ARP data with said distributing module. The invention can make ARP data in distributing equipment keep global consistency. Besides, the invention determines the consistency of ARP data based on the message forwarding state so as to avoid loss of synchronization data or synchronization failure caused by adding ARP list item using software.