107 results about "Delay analysis" patented technology

A packet and a method for analyzing network latency are disclosed. The disclosed systems and methods measure the latency between nodes in a network and do so while using less bandwidth and processing than traditional methods by using a packet to traverse a network and collect timestamps at various nodes so that the delay in transit time between nodes can be calculated when the packet returns to a server.

The invention relates to a universal satellite ground overall control test system, which consists of a front-end photoelectric conversion module, a measurement and control front-end equipment module, a central processing unit module, a display terminal module and a console module, wherein the front-end photoelectric conversion module is an external hardware interface of the ground overall controltest system and a tested system, and is internally connected with the measurement and control front-end equipment module; the measurement and control front-end equipment module finishes data interaction with the front-end photoelectric conversion module, and a rear end communicates with the central processing unit module and the console module; the central processing unit module receives downlinktelemetry data from the measurement and control front-end equipment module, finishes classifying and storing the data, forwards the data to the display terminal module, and simultaneously, is required to finish storing the uplink remote control information of the console module; the display terminal module receives the telemetry data from the central processing unit module, and finishes work in areal-time analysis way and a delay analysis way; and the console module transmits an uplink remote control instruction to the measurement and control front-end equipment module, and forwards uplink instruction information to the central processing unit module for filing.

A statistical delay simulation apparatus includes: a circuit simulator for simulating a circuit operation of a circuit cell constituting an LSI; a statistical delay library generator for driving the circuit simulator and generating, based on a process parameter and the like, a statistical delay library in which the dependency of a delay variation on a predetermined operation condition in each circuit cell is described; a delay calculator for calculating a delay amount of each circuit cell to generate a statistical LSI delay information file containing data on the calculated delay amount; and a static timing analyzer for simulating, based on data of the statistical LSI delay information file, an operation with a delay variation of the LSI to generate a statistical LSI delay analysis result file.

Methods and apparatus are described for measuring latency in computer systems. A computer system includes a processor, memory, and I/O. The processor is operable to initiate transactions involving the memory and the I/O. The computer system further includes a latency counter operable to measure a latency for each of selected ones of the transactions. The system also includes a plurality of histogram counters. Each histogram counter is operable to count the latencies corresponding to an associated latency range.

A program parallelization apparatus which generates a parallelized program of shorter parallel execution time is provided. The program parallelization apparatus inputs a sequential processing intermediate program and outputs a parallelized intermediate program. In the apparatus, a thread start time limitation analysis part analyzes an instruction-allocatable time based on a limitation on an instruction execution start time of each thread. A thread end time limitation analysis part analyzes an instruction-allocatable time based on a limitation on an instruction execution end time of each thread. An occupancy status analysis part analyzes a time not occupied by already-scheduled instructions. A dependence delay analysis part analyzes an instruction-allocatable time based on a delay resulting from dependence between instructions. A schedule candidate instruction select part selects a next instruction to schedule. An instruction arrangement part allocates a processor and time to execute to an instruction.

The invention discloses a method of measuring end-to-end delay of mobile phone?video?communication application. Firstly, a section of visual coding timestamp sequence?video is generated and displayed on an LCD display; secondly, a sender mobile phone and a receiver mobile phone build video connection via video?communication application, the visual coding timestamp sequence?video shot by the sender is sent to the receiver, and the receivers displays the conversation content with the visual coding timestamp sequence?video included on a screen; thirdly, a high-definition camera is used for shooting the LCD display and the receiver screen at the same time; and finally, the acquired video data with the visual coding timestamps included is sent to a delay analysis system, the timestamp on each frame is recognized, time difference among the timestamps is calculated, and the end-to-end delay is obtained. According to the method disclosed by the invention, from?the?perspective?of?the?computer vision, the delay measurement problem is converted into the timestamp reorganization problem, the operation process is simple, the difficult problem of synchronization of different clocks is avoided, and accuracy of delay detection is improved.

The invention discloses an urban road network generalized road right calculating method considering comprehensive traffic management measures. The method comprises road section time impedance calculation with traffic management measures being taken into consideration and intersection delay calculation under a traffic control strategy, and specifically comprises road section basic traffic capacity analysis, influence correction of the traffic management measures on road section traffic capacity, road section time impedance analysis and correction of the traffic management measures on road section time impedance; and intersection entrance road lane group division based on turning relation, lane group motor basic traffic capacity analysis, influence correction of the traffic management measures on lane group traffic capacity and intersection delay analysis for traffic assignment. The method can reflect independent road rights of different types of vehicles in an urban road network, can enable simulation and prediction results to be more accurate, quantifies difference of different traffic management strategy combination schemes and provides powerful support for planning of current urban traffic management and control and formulation of traffic policies.

The invention relates to the technical field of robots, and provides a master-slave underwater robotic arm delay control method which can achieve coordinated control on the master arm and the salve arm of a master-slave underwater robotic arm in a bad operating environment and under the condition of transmission communication delay. The method comprises the following steps: giving the structure parameters of an underwater robotic arm, and making a delay analysis of the master and slave robotic arms according to a kinematics model of the underwater robotic arm; collecting hydrodynamic factors, and verifying whether the performance of the robotic arm meets the demand of the model according to the kinematics model of the underwater robotic arm; and delaying an action signal of the master arm, caching joint control signals at first n moments in an underwater controller, and calculating the ideal motion position of the joint of the slave arm at a moment n+1 based on a multi-power curve fitting method. The problem that an underwater robotic arm works intermittently due to a bad operating environment and transmission communication delay is solved.

The invention provides a video delay testing device in a monitoring system. The device comprises a video signal generator, a video delay analysis unit and a synchronization link, wherein the video signal generator is used for generating a continuously changing time varying video signal and a timestamp of each frame of image and packaging and transmitting image mode information and time information to the delay analysis unit; the video delay analysis unit is used for identifying a frame mode of a decoded video to determine system time generated by the frame mode and subtracting frame mode occurrence time from the system time which is decoded and displayed currently to obtain video transmission delay of the system; and the synchronization link is used for realizing synchronization of the video signal generator and the video delay analysis unit. The device solves a problem of video delay measurement in an actual engineering application, provides the realizable video delay measurement device and method for related professional institutes and construction units, fills a blank of the measurement field and improves the technological level of the national security and protection system, especially the monitoring system.

The invention discloses a flight delay causality network building method based on a Granger test, pertaining to the technical field of delay analyses for civil aviation. The method comprises the following steps: firstly, acquiring a delay time sequence of each airport with the set time period according to historical data of flight of airports; then, taking each airport as a node for the network and testing a Granger causality of each pair of airports, when an airport I causes delay of an airport j by the test and establishing a directed edge from a node i to node j; and ultimately, repeating the above processes till selected airports are added to the network and making flight delay analyses by means of the obtained network. Through the established flight delay causality network, the numberof delay dissemination paths is analyzed for some large airports. Therefore, the delay dissemination range is narrowed, thereby effectively resolving a delay problem. The delays disseminated by an overall system are reduced. Therefore, loss caused by many flight delays is lowered.

The invention discloses a flight delay statistical method and a flight delay statistical device, wherein, the flight delay statistical method comprises: real-time data of flight operation is monitored, a flight operation model is built, and a flight flying section plane is computed; flow control information is received, format conversion of the information is realized, and flights that are directly influenced are computed according to the flight flying section plane; successive connecting information and station turnaround time of flights are summarized, flights that are indirectly influenced are computed, and the flight delay number is the sum of the flight numbers that are directly influenced and indirectly influenced. The flight delay statistical method and device can analyze the directly or indirectly influenced flights and the delay degrees thereof according to the flow control information of air traffic management, improve the accuracy of delay analysis and lower delay influence.

A delay analyzing apparatus receives a result of timing analysis of a target circuit, and detects, from paths in the target circuit, critical paths based on the result of the timing analysis with a detecting unit. A first calculating unit calculates an average delay distribution of the paths other than the critical paths based on an average delay value of each of the critical paths. A second calculating unit calculates a probability density distribution of the critical paths, and a third calculating unit calculates a probability density distribution of all of the paths based on the average delay distribution. A fourth calculating unit calculates difference between a statistical delay value of the critical paths and a statistical delay value of all of the paths based on the probability density distribution of the critical paths and the probability density distribution of all of the paths.

A multi-functional graphical user interface facilitates the analysis and assessment of application delays, including delays that occur on multiple paths. A trace file of an application's network events is processed to categorize the causes of delays incurred in the propagation and processing of these events. The system identifies the amount of delay (‘component delay’) that can be eliminated by eliminating each of the components of delay individually, as well as the amount of delay (‘parallel delay’) that can be eliminated by eliminating combinations of the delay components. A user interface displays the amount of reduction that can be achieved by eliminating each component delay individually and the amount of reduction that can be achieved by eliminating combinations of the individual component delays. To facilitate the analysis and assessment of these potential reductions, the interface allows the user to ‘drill down’ to view the individual delay components contained in each combination forming the parallel delays. In this manner, the user is provided a view of each of the delay components that would need to be addressed, either individually or in combination, to improve the overall application delay.

The invention provides a four-road annular intersection design method based on single entrance release. In terms of adjacent entrances and annular road trapezoid car storage area, an original single entrance release signal cycle model is modified, a modified four-road annular intersection single entrance release signal control mode is provided, signal phase of the control mode is coordinated, steps for phase coordination time difference calculation is elaborated, and preliminary discussion of application conditions of the control mode is provided one the basis of intersection traffic capacity and delay analysis. The traffic capacity and delay analysis results show that by the control mode, intersection traffic capacity is increased by more than 20%, and delay is reduced by more than 30%.

A delay analysis device includes a receiving unit that receives a result of a timing analysis of a target circuit to be analyzed, a detecting unit that detects critical paths having delays within a predetermined range, a statistical-delay computing unit that computes a statistical delay of the target circuit based on a cumulative probability distribution of the delays of the critical paths, and a probability-density-distribution computing unit that computes a probability density distribution of delay of a critical path that has the greatest delay in the result. The detecting unit detects x number of critical paths having cumulative delays within computed probability density distribution.

The present invention discloses a passenger characteristic analysis method for a track transportation junction. The method comprises the following steps: junction station pedestrian space demand analysis; junction station pedestrian flow macroscopic characteristic analysis; and pedestrian delay analysis. According to the analysis method disclosed by the present invention, pedestrian behavior characteristic theories, including a pedestrian flow microscopic theory, a pedestrian macroscopic theory and a statistic regression method, are applied to track transportation junction passenger characteristic analysis work, the pedestrian space demand is analyzed according to video information and an equation is obtained by means of curve fitting for the pedestrian flow macroscopic characteristic on different facilities, and a conclusion of whether a current facility meets a maximum traffic capacity or not is given out.

The embodiment of the invention provides a VoLTE call delay analysis method and device. The method comprises the following steps: acquiring an interface data set related to a VoLTE calling process ina preset time period, wherein each interface data at least comprises a user identifier and a timestamp; according to the user identifier and the timestamp, each piece of interface data belonging to auser group calling bill, and sorting according to the sequence of the timestamps; dividing the user group call ticket into a preset number of segmented tickets according to the sequence generated by the related interface data in the VoLTE call process; According to the timestamps of the interface data in the segmented call tickets, obtaining the segmented call tickets; obtaining the time delay ofeach segmented call ticket, According to the embodiment of the invention, the user group call ticket corresponding to the VoLTE call process is formed by the collected interface data; and extracting akey segmented call ticket to calculate the segmented time delay so as to establish a VoLTE call multi-interface association analysis system and a multi-interface association analysis tool, thereby meeting the maintenance requirements of rapid positioning and problem solving.