43results about How to "Implementation Latency" patented technology

The invention discloses a base station caching method based on the minimized user delay in an edge caching network, and belongs to the field of wireless mobile communication. In an edge caching network scene, a connection matrix between a user and a base station is established at first; simultaneously, a strategy that the base station caches a file is generated; a relationship matrix between the base station and the file is established; then, the average hit rate that all users in the whole network obtain the file from the base station is counted; a constraint condition is set to achieve the optimal minimum network user average delay when satisfying a reasonable user average hit rate threshold value; a traversing method is further used for solving and finding an optimal base station content storage strategy; a small base station is deployed according to the strategy; and finally, a user is connected to the small base station to obtain the file. According to the base station caching method based on the minimized user delay in edge caching network disclosed by the invention, the balance problem of the average delay and the average hit rate in a process of designing the small base station file caching strategy of the edge caching network is sufficiently considered; and thus, the purpose of minimizing the user average downloading delay when a certain user average hit rate is satisfied is realized.

The invention provides a multi-mode mobile satellite communication verification system and verification method. The system comprises a terminal simulator, a user link channel simulator, a receiving multi-beam antenna simulator, a return link processor, a subband exchange processor, a signal regeneration processor, a forward link processor, a transmitting multi-beam antenna simulator, a feeder link channel simulator, a gateway station simulator and a control center, a user segment, a space segment, a ground segment and a mobile satellite communication channel of a mobile satellite communication system are separately simulated. The system can perform demonstration verification on the link performance and the business ability of the mobile satellite communication system adopting a plurality of satellite-borne processing modes and multiple communication systems, and solves the problem that related verification system and method is lacked at present and technical feasibility verification cannot be provided for engineering application. Meanwhile, the invention further discloses a verification method of the verification system.

The invention is appropriate for the communication filed, which provides a fiber optic repeater, a time delay measurement method and a device for the same. The method comprises the steps below: the capped end equipment of each level in local equipment forward N-1 level capped end sends a time delay test instruction respectively; the capped end equipment of each level that receives the time delay test instruction tests this level single transmission time delay of the optic fiber link between itself and next-level capped end equipment; the local end equipment acquires the single line transmission time delay of the optic fiber link between the local end equipment and the N-level capped end equipment, according to the sum of this level single line transmission time delay acquired by each level capped end equipment in the former N-1 level capped end equipment, to compensate base band signal time delay of the former N-1 level capped end with reference on the single line transmission time delay. The embodiment of the invention implements the situation below: when multi-level capped end equipment is concatenated in the fiber optic repeater, the up / down link base band I / O signal time delay of all the capped end equipment is aligned automatically, so that the fiber optic repeater can work coordinately and stably.

The invention provides a method for measuring performance of an Ethernet. The method comprises the following steps: sending a performance measurement request message to a second MEP by a first MEP, wherein the message comprises a first performance measurement parameter; receiving a first performance measurement response message sent by the second MEP, wherein the first performance measurement response message carries a third performance measurement parameter and a fourth performance measurement parameter; receiving a second performance measurement response message sent by a first MIP, wherein the second performance measurement response message carries a first performance measurement parameter, a second performance measurement parameter and a fifth performance measurement parameter; after receiving the first performance measurement response message and the second performance measurement response message, recording a sixth performance measurement parameter; calculating performance parameters between the first MEP and the second MEP and the performance parameters between the first MEP and the MIP according to the performance measurement parameters. By virtue of the method, device and system provided by the embodiment, measurement on packet loss, time delay and jitter performance of each node on a service path can be finished at a time and multiple times of measurement for subregions are not needed.

The invention provides a high speed full optical Orthogonal Frequency Division Multiplexing (OFDM) system and a modulation / demodulation method thereof. In the method, a laser generates an ultrashort pulse signal which is then modulated according to a certain modulation code sequence; the pulse series of the modulation signal and the ultrashort pulse signal are synchronized through an electricallyadjustable delay line; the modulated signal is divided into two ways of signals through a first coupler; the two ways of signals are multiplexed respectively through a first multiplexer and a second multiplexer; the multiplexed signals are integrated through a second coupler; and the integrated signals are demultiplexed through a de-multiplexer. By using the high speed signal processing techniquein optical fiber, the system and the method realize the full optical domain OFDM modulation and demodulation, thus obtaining greater operation bandwidth and higher processing speed.

The present invention provides a real-time Ethernet device performance test method which is applied to a test device. The method comprises the steps of: receiving a test example sent by a test upper computer; according to the test example, sending a delay test request message to a monitored device, receiving a delay test reply messages sent by the monitored device, and / or receiving a stability test message sent by the tested device; according to the delay test request message and the delay test reply message, sending delay test data to the test upper computer through a preset timestamp interface, and / or according to the stability test message, sending stability test data to the test upper computer through a preset interface message error interface or a receiving message correction messageto allow the test upper computer to perform analysis to obtain a test result according to the delay test data and / or the stability test data. The method provided by the invention achieves the Ethernetstability device and the delay test of the monitored device and mainly a terminal-type device.

The present invention discloses a grading control computer system based on the optical packet switch and optical multicast, including at least two groups of CPUs (A), and optical interconnection switching devices linked between the CPUs (A). The optical interconnection switching devices include at least a first level node (1) and a second level node (2). The current HPCS usaully takes use of the centralized control mode: each port has to send the request signals to a central dispatcher after it generates a business, and if the distance is longer, it may introduce a trip delay having a larger request and answer signal. The present invention adopts a grading controlled management style, in which the node is only needed sent requests to the local control unit, thus it can greatly reduce such delay, and at the same time, can reduce the storage and computing pressure of each level control unit.

The invention discloses a network performance measuring method, apparatus and system. The method is used for measuring the network performance parameters of the communication link between a first device and a second device. The first device is configured to be a control client and a session initiating side to implement the TWAMP, and the second device is configured to a server and a session response side to implement the TWAMP. The network performance measuring method is applied to the first device and includes creating the TWAMP type SLA work after a work creation command is received; starting to schedule the TWAMP type SLA work after the starting work scheduling command is received; by scheduling the TWAMP type SLA work to realize the following operation: negotiating with the second device the UDP port number used in the interactive testing of messages; interactively testing the messages with the UDP port determined by the negotiation and the second device; and measuring the network performance parameters according to the interactive testing messages.

According to the edge cloud collaborative deep learning target detection method based on target tracking acceleration provided by the invention, the problem that the real-time performance of the target detection problem cannot be guaranteed is solved. The method comprises the following three stages of processing: in the first stage, a key frame selection method is provided by using a self-adaptive key frame algorithm on an edge node, and key frames are selected in the same deep learning model only by extremely low computing resource cost; and a second stage, at the cloud, high-precision target detection is peformed by using the edge screened data and a high-precision classification model; and a third stage, at an edge end, rapid tracking is carried out through classification of key frames and a frame marking result by utilizing a twin network, and according to the method, data screening aiming at video target detection is realized by utilizing an adaptive key frame algorithm, and meanwhile, compromise between model precision and time delay consumption is realized. A reliable scheme is provided for solving the video target detection problem of the edge cloud collaborative deep learning model.

The invention provides a miniaturized tunablebroadband stable-phase optical fiberdelay line. The miniaturized tunablebroadband stable-phase optical fiberdelay line comprises a first low-noise microwaveamplifier, a broadbanddirectly modulated laser, an optical circulator, a first single mode fiber, a first magneto-optical switch, a second single mode fiber, a first fiber reflecting mirror, a second magneto-optical switch, a third single mode fiber, a second fiber reflecting mirror, a third fiber reflecting mirror, a broadbandphotoelectric detector and a second low-noise microwaveamplifier. The problem that a traditional optical fiberdelay line is sensitive to temperature change and transmissionbroadbandmicrowave signalphase drift is severe is mainly solved. In addition, the problem that an active temperature control or feedback compensation type optical fiber stable-phasedelay line is cumbersome, complicated in structure and poor in repeatability is also solved.

The method detecting changes of MAC address of AP is used to detect happening of switch. Non-uniform interval detection model is used to make detection. When MN detects happening of switch, it gets new MAC address of AP. With looking up mapping table, MN gets the IP address of AR and subnet prefix in the accessed ESS. The MAC address of MN and the subnet prefix of its neighboring ESS are used to build care-of-address of MN, and makes uniqueness authentication and pre-login to AR in its neighboring ESS. The features of invention includes: detection to mobility of node doesní»t require support of beacon and trigger in link layer, and can be implemented in network layer so that it can be applied in existing WLAN environment directly.

The invention provides a method for testing a multi-mode apparatus. The method comprises the following steps of: loading a plurality of pieces of testing engineering, wherein the plurality of pieces of the testing engineering comprises apparatus testing engineering and equipment testing engineering; setting running identifiers for the apparatus testing engineering and the equipment testing engineering, performing monopolistic control on a data acquisition card by adjusting the running identifiers, and occupying the data acquisition card in different time sharing by the apparatus testing engineering and the equipment testing engineering; detecting a communication type of an apparatus to be tested or equipment to be tested, and initializing the corresponding data acquisition cards respectively according to the communication type; and running the plurality of pieces of testing engineering in a preset command mode by the data acquisition card. In the invention, the monopolistic requirement on the data acquisition card and communication network using is met during testing of the different apparatuses to be tested or in the different testing engineering by setting the running identifiers, and test on a plurality of characteristics, such as an apparatus execution instruction, time delay, a continuous execution instruction and the like is realized at the same time. The invention also discloses a system for testing the multi-mode apparatus.

The invention discloses an LDPC decoding method suitable for an NAND flash memory. The method comprises the steps of introducing a new judgment variable En, and obtaining performance superior to thatof a bit flipping algorithm on the basis of not significantly increasing the calculation amount. For a circuit of the NAND flash memory, a new error correction algorithm has the following advantages that the logic complexity is low, and a programming circuit is simple; real number operation is only needed instead of floating point operation or multiplication and division operation, and the operation power consumption is small; the new error correction algorithm is suitable for a parallel structure, and the operation time delay is low; the flipping threshold value is adjustable, and by adjusting the threshold value, the dynamic balance of time delay and error correction performance can be achieved.

The invention discloses an intelligent integrated cabinet for playgrounds. The intelligent integrated cabinet comprises a cabinet body capable of accommodating shared sporting items, storing articlesand vending goods; the cabinet body is provided with a control system for controlling the working of the cabinet body; the control system comprises a control module, a payment module, a power supply module, a plurality of control locks, a communication module which is capable of communication, a security and verification module which is capable of performing security monitoring and completing information verification, and a display screen which is capable of displaying operating steps and the use condition of the cabinet body; the control module, the communication module and the payment moduleare all disposed in the cabinet body; and the security and verification module is disposed at the front of the cabinet body; and the cabinet body is composed of a cabinet top cover, an outer frame, ashared cabinet body, a storage cabinet body and a vending cabinet body. The intelligent integrated cabinet of the invention is a multi-functional integrated cabinet integrating the functions of itemsharing, article storage and goods vending, and is mainly arranged at sports venues such as sports halls, parks and schools, and provides great convenience for sports enthusiasts.

The invention provides an intelligent operation control system and device. The device comprises a plurality of intelligent operation control systems; each intelligent operation control system comprises an edge intelligent operation control system, a second-stage intelligent operation control system and an n-stage intelligent operation control system; n is an integer greater than or equal to 2; the plurality of edge intelligent operation control systems is connected to one secondary intelligent operation control system; a plurality of second-level intelligent operation control systems is connected to one third-level intelligent operation control system; and so on, connection is carried out; each intelligent operation control system comprises an operation center and at least one intelligent operation control terminal; each operation center is connected with each intelligent operation control terminal; each operation center is at least one server, equipment communication and protocol conversion are executed in a local machine, and microsecond-level time delay and nanosecond-level clock synchronization are achieved; the internet of things of the industrial internet can be quickly constructed, and industrial digital upgrading is enabled.

The invention provides a low-loss and low-crosstalk gradient refractive index distribution three-mode modulus division multiplexer. The low-loss and low-crosstalk gradient refractive index distribution three-mode modulus division multiplexer is composed of three same transmission channels, wherein one transmission channel is a main transmission channel; the radius of each transmission channel is 20mu m; the refractive index difference between a fiber core and a cladding layer of each transmission channel is 0.0015 and the refractive index of the cladding layer is 1.442524; the refractive indexfrom the central of each channel core to the corresponding cladding layer is changed in a gradient manner; a mode LP01 is directly input into the main transmission channel; mode LP11a and LP11b channels are arranged in x and y directions of the cross section of the main transmission channel; the length of each channel is 33mm and the distance between each channel and the main channel is 6mu m; the coupling efficiency of the multiplexer is better than -0.479dB in a wave range of 1400nm to 1700nm; the refractive index gradient change type distribution, low-loss and low-crosstalk three-mode modulus division multiplexing is realized.

The invention provides a high speed full optical Orthogonal Frequency Division Multiplexing (OFDM) system and a modulation / demodulation method thereof. In the method, a laser generates an ultrashort pulse signal which is then modulated according to a certain modulation code sequence; the pulse series of the modulation signal and the ultrashort pulse signal are synchronized through an electrically adjustable delay line; the modulated signal is divided into two ways of signals through a first coupler; the two ways of signals are multiplexed respectively through a first multiplexer and a second multiplexer; the multiplexed signals are integrated through a second coupler; and the integrated signals are demultiplexed through a de-multiplexer. By using the high speed signal processing technique in optical fiber, the system and the method realize the full optical domain OFDM modulation and demodulation, thus obtaining greater operation bandwidth and higher processing speed.

The invention discloses an LB detection method and system based on MPLS-TP OAM, relates to the technical field of communication, and aims to expand LB detection in MPLSTP OAM, realize time delay and packet loss measurement under LB detection and improve the detection efficiency. And the station-by-station measurement time delay and packet loss measurement of the station-passing node are realized,and the defects that only end-to-end measurement can be realized and the station-by-station measurement of the station-passing node cannot be realized in the existing LM / DM measurement technology areovercome. And meanwhile, a station-by-station detection function of LB similar to Trace is realized, and rapid fault positioning of engineering operation and maintenance is facilitated.

The invention relates to the technical field of communication networks, and particularly discloses a hybrid relay selection method for an intensive communication network, which comprises the followingsteps: taking a group of switching nodes as an information source node and an information sink node, M configurable relay nodes being arranged between the group of switching nodes, and K subcarriersbeing used by the group of switching nodes; and excluding relay nodes at adverse positions by setting parameters of an adjustment timer. The channel state information monitoring burden of the information source node can be reduced, and the burden is distributed to each relay node for bearing in a 'distributed' manner; the dynamic balance among the system stability, the time delay and the signalingburden can be conveniently realized by adjusting the parameters of the timer; and meanwhile, the method is high in expandability, and the method can be easily expanded to super-multi-antenna selection and other complex communication resource allocation scenes.

The invention discloses a transmitter test system and method based on a real-time digital-analog simulation system. The system comprises a tested transmitter, an information feedback device and the real-time digital-analog simulation system, wherein a transmitter test simulation model is established by the real-time digital-analog simulation system according to test parameters required by the tested transmitter, and a current and / or voltage signal is outputted in a small power signal mode to the tested transmitter; in combination with an electrical signal outputted by the tested transmitter and set values of the corresponding tested parameters, whether the electrical signal at an output end of the tested transmitter meets the excessive logic test condition is detected by the information feedback device according to excessive logic test pressure plates, whether the electrical signal at the output end of the tested transmitter meets the under-logic test condition is detected by the information feedback device according to under-logic test pressure plates, and the detection result is fed back to the real-time digital-analog simulation system in the form of a contact signal; whether the test result is correct is determined by the real-time digital-analog simulation system according to the received contact signal. The system is advantaged in that test efficiency of the transmitter can be greatly improved.

The invention relates to a low-delay end-to-end communication method based on a CAN bus. The method comprises the following steps: connecting a plurality of spacer layer devices with a CAN communication gateway through the CAN bus; connecting the CAN communication gateway an external device through a low-delay PHY Ethernet port or a 5G module, wherein the low delay is the connection of microsecond-level time delay; when the spacer layer device communicates with the CAN communication gateway, using a method of priority automatic conversion or intelligent adjustment of the CAN load rate so thatthe communication delay is lower than 5ms. The method is suitable for a standard CAN bus hardware lower-layer protocol, formulates a standard protocol for an application layer, realizes 'low delay' and 'end-to-end' communication characteristics by embedding CPU software and hardware for optimization, and can also solve the problem of 'last kilometer communication' data high-speed communication.

The invention provides a multi-mode mobile satellite communication verification system and verification method. The system comprises a terminal simulator, a user link channel simulator, a receiving multi-beam antenna simulator, a return link processor, a subband exchange processor, a signal regeneration processor, a forward link processor, a transmitting multi-beam antenna simulator, a feeder link channel simulator, a gateway station simulator and a control center, a user segment, a space segment, a ground segment and a mobile satellite communication channel of a mobile satellite communication system are separately simulated. The system can perform demonstration verification on the link performance and the business ability of the mobile satellite communication system adopting a plurality of satellite-borne processing modes and multiple communication systems, and solves the problem that related verification system and method is lacked at present and technical feasibility verification cannot be provided for engineering application. Meanwhile, the invention further discloses a verification method of the verification system.

The invention discloses a method and a system for measuring IQ two-path delay inequality and frequency response of a transmitter, and belongs to the field of communication. According to the method, two signals meeting a specific relation are used at a transmitting end, a low-bandwidth photoelectric detector (PD) is used at a receiving end to receive the signals, low-frequency signals containing time delay information are extracted by utilizing the characteristic of low bandwidth, and the frequency response of a transmitter and IQ two-path time delay difference are measured at low cost. Moreover, the receiving end only needs to perform simple correlation and expectation operation on the signal by using the single-tone signal with the known frequency, and does not need to adopt a complex DSP (Digital Signal Processor) equalization algorithm to solve the time delay of the transmitting end, so that the signal processing complexity of the receiving end is reduced.

The present invention discloses a grading control computer system based on the optical packet switch and optical multicast, including at least two groups of CPUs (A), and optical interconnection switching devices linked between the CPUs (A). The optical interconnection switching devices include at least a first level node (1) and a second level node (2). The current HPCS usaully takes use of the centralized control mode: each port has to send the request signals to a central dispatcher after it generates a business, and if the distance is longer, it may introduce a trip delay having a larger request and answer signal. The present invention adopts a grading controlled management style, in which the node is only needed sent requests to the local control unit, thus it can greatly reduce such delay, and at the same time, can reduce the storage and computing pressure of each level control unit.

The invention discloses a time delay measurement method, device and equipment and a readable storage medium. The method comprises the following steps: each node receiving a negotiation message performs timestamp on the message according to a stamping rule contained in the negotiation message; obtaining timestamps stamped for the same message by different nodes; and subtracting the timestamps marked for the same message by different nodes to obtain time delays among the different nodes. According to the invention, the message content does not need to be edited, and the time delay between the nodes is measured on the premise that the link bandwidth is not additionally increased.

The invention provides a miniaturized tunablebroadband stable-phase optical fiberdelay line. The miniaturized tunablebroadband stable-phase optical fiberdelay line comprises a first low-noise microwaveamplifier, a broadbanddirectly modulated laser, an optical circulator, a first single mode fiber, a first magneto-optical switch, a second single mode fiber, a first fiber reflecting mirror, a second magneto-optical switch, a third single mode fiber, a second fiber reflecting mirror, a third fiber reflecting mirror, a broadbandphotoelectric detector and a second low-noise microwaveamplifier. The problem that a traditional optical fiberdelay line is sensitive to temperature change and transmissionbroadbandmicrowave signalphase drift is severe is mainly solved. In addition, the problem that an active temperature control or feedback compensation type optical fiber stable-phasedelay line is cumbersome, complicated in structure and poor in repeatability is also solved.

The invention provides a method for measuring performance of an Ethernet. The method comprises the following steps: sending a performance measurement request message to a second MEP by a first MEP, wherein the message comprises a first performance measurement parameter; receiving a first performance measurement response message sent by the second MEP, wherein the first performance measurement response message carries a third performance measurement parameter and a fourth performance measurement parameter; receiving a second performance measurement response message sent by a first MIP, wherein the second performance measurement response message carries a first performance measurement parameter, a second performance measurement parameter and a fifth performance measurement parameter; after receiving the first performance measurement response message and the second performance measurement response message, recording a sixth performance measurement parameter; calculating performance parameters between the first MEP and the second MEP and the performance parameters between the first MEP and the MIP according to the performance measurement parameters. By virtue of the method, device and system provided by the embodiment, measurement on packet loss, time delay and jitter performance of each node on a service path can be finished at a time and multiple times of measurement for subregions are not needed.

The invention discloses a network performance measuring method, apparatus and system. The method is used for measuring the network performance parameters of the communication link between a first device and a second device. The first device is configured to be a control client and a session initiating side to implement the TWAMP, and the second device is configured to a server and a session response side to implement the TWAMP. The network performance measuring method is applied to the first device and includes creating the TWAMP type SLA work after a work creation command is received; starting to schedule the TWAMP type SLA work after the starting work scheduling command is received; by scheduling the TWAMP type SLA work to realize the following operation: negotiating with the second device the UDP port number used in the interactive testing of messages; interactively testing the messages with the UDP port determined by the negotiation and the second device; and measuring the network performance parameters according to the interactive testing messages.