72results about How to "Reduce latency jitter" patented technology

A method of the communication includes communicating at least one physical layer frame. The physical layer frame is formed by dynamically varying an aggregate packet size in response to a condition of a channel used for communicating voice and / or data. Here, the step of dynamically varying aggregate packet size may involve modifying a number of content frames to form the physical layer frame. The physical layer frame may correspond with a payload having at least two content frames and at least one IP header. Each content frame may include a voice frame and / or a data frame.

This invention provides one Ethernet exchange buffer and transfer method, which comprises the following steps: receiving data pack from input end; cutting data pack into certain length signal element by cut unit; storing signal element into central memory unit; adopting equal time lag transfer through end and line transfer unit and turning output end by each time lag; adopting run require or transfer of different lines at one output end; after getting transfer, reading signal element from common central buffer unit and the data pack resets the signal element sent to the linkage. This invention also provides one Ethernet exchange buffer and transfer device.

The invention discloses a vehicle-mounted delay tolerant network routing method based on node forwarding capability estimation. The vehicle-mounted delay tolerant network routing method comprises: a step 1: judging whether a destination node exists within the communication range of a source node, and if so, directly sending information to the destination node; otherwise, executing a step 2; step 2: estimating effective connection times Ta of the source node with all neighbor nodes within the communication range thereof; a step 3: selecting neighbor nodes with Ta values exceeding a threshold as candidate relay nodes; a step 4: creating a candidate relay node throughput function, and calculating average forwarding capability values of the candidate relay nodes; a step 5: using the candidate relay node having the maximum average forwarding capability value as a next hop relay node; a step 6: selecting the relay node through the source node, sending the information to the relay node, and using the relay node as a new source node; and a step 7: circularly executing the step 1 to the step 6 until streaming media information is successfully transmitted to the destination node. The vehicle-mounted delay tolerant network routing method disclosed by the invention is high in data packet delivery ratio, low in transmission delay and low in delay jitter.

A method for controlling acoustic echo cancellation and an audio processing apparatus are described. In one embodiment, the audio processing apparatus includes an acoustic echo canceller for suppressing acoustic echo in a microphone signal, a jitter buffer for reducing delay jitter of a received signal, and a joint controller for controlling the acoustic echo canceller by referring to at least one future frame in the jitter buffer.

The invention discloses a method for reducing the time delay and the time delay vibration of real-time service, which is characterized in that: said method comprises: setting the size of initial receiving buffer area; setting the data frame waiting time according to the sizes of initial receiving buffer area and the application service bandwidth; the sending end divides the network data package of real-time service into several wireless chain protocol data frames to be transmitted to the receiving end; the receiving end receives the wireless chain protocol data frames in the waiting time of data frame; regulating the size of buffer area according to the time delay vibration condition that the wireless chain protocol data frames reach the receiving end. The invention can reduce the time delay vibration caused by the chain circuit transmission, reduce the voice vibration of VoIP service and improve the voice quality of VoIP service.

A method of the communication includes communicating at least one physical layer frame. The physical layer frame is formed by dynamically varying an aggregate packet size in response to a condition of a channel used for communicating voice and / or data. Here, the step of dynamically varying aggregate packet size may involve modifying a number of content frames to form the physical layer frame. The physical layer frame may correspond with a payload having at least two content frames and at least one IP header. Each content frame may include a voice frame and / or a data frame.

The embodiment of the invention discloses data routing method and equipment, being applied to the technical field of communication. In the embodiment of the invention, the data routing method of real-time service comprises the following steps that a first node sends a relay acquisition request after two nodes establish the conversation of the real-time service; a third node determines the relay node of an application layer according to the default paths of the two nodes, the path information of the first node routing to a node in the cluster of a detected routing domain and the time delay of the first node routing to a second node from the node in the cluster of the detected routing domain, and thus, real-time service data can be sent to the second node through the relay node in the application layer. Due to the fact that multiple routing paths of the real-time service data have difference with the default path, the sudden service flow in the Internet can be reduced, or the probability of network transmission time delay change caused by the changes of routes in AS (Attribute of Source) domains and among the AS domains is reduced, therefore, the time delay jitter in real-time service is reduced.

The invention discloses a controlling method for a burst assembly, a corresponding device and a communication equipment thereof. A core of the method and the device in the invention includes the following steps: by comparing an assembly time with a time threshold set in advance, a change trend of carriers in a buffer queue is judged; if the change of the carrier burst is increased or reduced, a length threshold is directly increased or reduced; if the carriers are in an increasing trend, the threshold is randomly increased according to a certain probability; if the carriers are in a reducing trend, the threshold is randomly reduced according to a certain probability; if the carrier is normal, the length threshold is not adjusted, therefore, the length threshold can realize dynamic adjustment with the changes of the carrier. By adopting the method and the device provided by the invention, a delay from a business end to anther business end is assured, thus optimizing the performance of the network.

The invention discloses a service flow shaping method and a service flow shaping device for a cascaded port of an avionics full duplex switched Ethernet (AFDX) switch. The main problems of relatively stronger switching delay jitter of packets and incapability of transmitting high-priority packets on time in the prior art are solved, and a system can be conveniently cascaded. The method comprises the following steps of: (1) extracting packet scheduling information; (2) extracting the information of a time registry; (3) receiving and scheduling the packets; (4) selecting and sequencing the packets; (5) updating time tags; (6) transmitting and scheduling the packets; and (7) updating a time registry. The device comprises an input caching module, a receiving scheduling module, a time registry module, a packet information storage area module, a time tag module, an output queue module, a transmission scheduling module and an output caching module. The method and the device have the advantages that: the determinacy of the delay jitter of the packets can be ensured; the forwarding delay jitter of the packets can be effectively reduced; the high-priority packets can be transmitted on time; and the method and the device are applied to the traffic shaping of the AFDX switch.

The invention discloses a retransmission method and a retransmission system for a radio link control (RLC) layer. The method comprises that: a transmitter transmits RLC data by a hybrid automatic repeat request (HARQ) entity, and a receiver fails to receive the RLC data and informs the transmitter of a data transmission failure of the HARQ entity; and the HARQ entity of the transmitter reports the data transmission failure to an RLC entity of the transmitter, and the RLC entity of the transmitter retransmits the RLC data failed to be transmitted by the HARQ entity of the transmitter. By the method and the system, interaction for the HARQ transmission failure is realized between the HARQ entity and RLC entity of the transmitter, so the message retransmission time of the RLC layer is effectively shortened, time delays of data services in high speed packet access (HSPA), evolved HSPA (HSPA+) and long term evolution (LTE) networks are effectively shortened, the fast message retransmission function of the RLC layer is realized, delay jitter caused by the wireless packet loss is reduced, and simultaneously, service downloading and uploading throughput is improved.

A delay unit 103 adds holding time that has been set by a holding time setting unit 104 to a received data. The holding time is computed based on delay time of received data and the minimum delay time of data received up to a certain point for the purpose of reducing a total delay time. The delay time is estimated in a delay time estimating unit 106 from the difference between a reception time of a packet counted based on an internal clock generator 107 and a time designated by a time stamp in the received packet.

The invention discloses a virtual channel multiplexing scheduling algorithm based on a satellite network. The scheduling algorithm belongs to the technical field of the satellite network and is characterized in that one period of the virtual channel scheduling is divided into Nt time slots by adopting a mixed emergency / synchronization / asynchronization three-level multiplexing manner, wherein one part is used for an emergent virtual information channel, and the time slot number of the emergent virtual information channel is set as Nu; one part is used for a synchronous virtual information channel, and the time slot number of the synchronous virtual information channel is set as Ns; and one part is used for an asynchronous virtual information channel, and the time slot number of the asynchronous virtual information channel is Na. Compared with the prior art, the scheduling algorithm can process emergent data at first time taking account of the isochronism of audio and video data and flexibly and efficiently process asynchronous data with strong burstiness simultaneously, thereby improving the utilization rate of the information channel.

The invention discloses an Ethernet flow control device and method based on microwave transmission. The Ethernet flow control method includes the steps: detecting adaptive coded modulation (ACM) information of wireless links in real time, and generating rate-limiting frames and sending the rate-limiting frames to a data sending end when the Ethernet bandwidth is changed due to changes of ACM; and monitoring changes of a buffering water level in real time while the ACM information is detected, generating flow-control frames and sending the flow-control frames to the data sending end when the buffering water level rises to a highest threshold, and generating flow-control removing frames and sending the flow-control removing frames to the data sending end when the buffering water level falls to a lowest threshold. The Ethernet flow control device comprises an ACM real-time detecting module, a rate-limiting frame generating module, a sending and buffering real-time monitoring module, a flow-control frame generating module and a scheduling module. According to the Ethernet flow control device and method, a sending rate is adaptively adjusted through combination of flow control and exit rate limiting, and time delay of high priority services can be guaranteed.

The invention provides a channel reservation based power control method in distributed wireless networks. According to the power control method, basic channel reservation serves as an access mechanism. The power control method includes: computing relevant parameters of a channel model (two-way model), then performing power control aiming at the three conditions: 1, in a competitive mode, a sending end S competes a channel successfully (a query result in a reservation table is true) and prepares to send an RTS (request to send) to a receiving end R; 2, in a reservation mode, the S prepares to send DATA to the receiving end R; and 3, a neighbor node N intercepts the DATA or ACK (acknowledge characters). By the aid of the channel reservation based power control method in the distributed wireless networks, channel multiplexing ratio is increased, network capacity is increased, energy consumption efficiency of the node is improved, life cycle of the networks is prolonged, channel access quality of real-time services is enhanced, and grouping delay jitter is reduced.

The invention discloses a reshaping scheduling method in an aviation electronic system network. The method comprises the steps of setting an adjusting period in a system, resetting a vector table of historical information, and carrying out static priority distribution on all virtual links in a network; updating the vector table of the historical information when a data base is arrived; updating a transmitting sequence of all virtual links in a next adjusting period according to the statistic priority and the historical information recorded in the vector table of the historical information, after the adjusting period is completed; transmitting the scheduling times according to the transmitting sequence recorded in the transmitting sequence table when a database reaches at the transmitting time. According to the method provided by the invention, the transmitting sequence of all virtual links in the aviation electronic system can be adjusted by adopting a dynamic and static combined way, so as to reduce the delay variation of ordinary links.

The invention discloses a satellite network snapshot routing optimization method. The method comprises the steps that S1 snapshots are generated according to the satellite network topology; S2 according to the preset optimization expectation, the preset average service duration and the duration of a single snapshot, the final value of the number of superimposed snapshots is determined; and S3 snapshots determined by the final value are superimposed to acquire a target topology; the link weight of the target topology is determined; a route is calculated through the target topology. According to the invention, link stability in an optimization interval can be effectively ensured; transmission stability in the optimization interval is ensured; route switching is reduced; and delay jitter, service interruption and the like caused by route switching is reduced.

The invention discloses an electric quantity data acquisition system based on a distributed message queue. The system comprises multiple substation front acquisition modules arranged at local dispatching sides, a distributed message communication management module arranged at a provincial dispatching side and a main station data integration module, wherein the local acquisition information is actively requested by the substation front acquisition modules from the distributed message communication management module and communicating with an electric energy remote terminal to acquire a time sharing electric energy value of a gateway electric energy meter after the acquisition archive information is dynamically loaded to a local database, the distributed message communication management module is used for carrying out cluster management of publishing / subscription message queue service nodes at the provincial dispatching side and task load balancing support, electric quantity data acquiredby each local dispatching side are gathered through publishing / subscription message queue service clusters provided by the distributed message communication management module at the provincial dispatching side, through a buffer queue cycle database input algorithm, the electric quantity data acquired by each local dispatching side are gathered and inputted at the provincial dispatching side by the data integration module.

The invention provides an IP router processing method and device based on an ASON optical network. A broadcasting sub-network is built on the ASON optical network. The method comprises: a first IP backbone router receives an IP packet sent by a first access network; on the basis of an IP destination address in the IP packet, and according to the longest prefix match principle, a local router information database query is done, and if multiple items of a router table are matched with the IP destination address, one of the multiple items is picked as the optimal router table item and an IP backbone router of the optimal router table item is notified to be a second IP backbone router; a local backbone router table query is done, and if an identifier of an ASON connection of the first IP backbone router to the second IP backbone router exists, the IP packet is sent to the second IP backbone router via the ASON connection according to the identifier, so that the IP packet received by the second IP backbone router is sent to a second access network.

The invention discloses a synchronization method for Non-IP data transmission. The synchronization method comprises: receives, by a receiver, stream information and time information of a voice streamin a real-time transport protocol RTP packet from a sender; storing the received information and recording a system frame number SFNi at the current moment by the receiver to obtain a mapping relationship between the time information and the system frame number SFNi; and when a receiver receives a voice packet transmitted in an No-IP mode from a sender, obtaining a system frame number SFNj at thecurrent moment, calculating a relative time difference between SFNi and SFNj, calculating a relative timestamp of the voice packet according to the time information, and recovering a corresponding RTPtimestamp. The invention further provides corresponding equipment. By applying the technical scheme disclosed by the invention, the receiver can recover the absolute time and the relative time of thevoice packet in a multi-stream concurrent scene, and multi-stream synchronization is realized, so that synchronous playing of videos and audios is recovered.

The invention discloses a multi-level subqueue layered dispatching method for messages in the communication network of a transformer substation. The method comprises the steps of 1, receiving the messages by a receiver; 2, analyzing the messages by a data analysis module and a label analysis module to obtain information, such as message contents, labels, destination addresses, VLAN (virtual local area network) values and message types; 3, testing whether the time to live TTL is greater than 0 or not, if the TTL is equal to 0, discarding the messages and finishing the process, and if the TTL is greater than 0, continuing the next step; 4, searching an MAC table according to the destination addresses and the VLAN values of the messages, and sending the messages to the corresponding ports; 5, identifying the message types according to the information of a message label tagged value field, and mapping different messages to a label-based multi-level subqueue for queuing up to be sent; 6, when one message reaches the head end of the queue, adding a new label to the current message by a label packaging module, packaging the current message by a data packaging module, and sending the current message to the next switch by a sender for finishing the forwarding process. The problems of delay variation, transmission delay and the like in message switching is well solved, and the real-time reliability of information transmission of the transformer substation is improved.

Disclosed herein is a terminal device including a photodetector, amplitude detecting circuit, light source, drive circuit, and control circuit. The photodetector receives a first optical signal. The amplitude detecting circuit detects the amplitude of an output from the photodetector. The drive circuit supplies a drive current to the light source so that the light source outputs a second optical signal. The control circuit decreases and increases the drive current according to an increase and decrease in the amplitude detected by the amplitude detecting circuit, respectively. In the case that this terminal device is used with another terminal device to construct a network, the dynamic range of the other terminal device can be reduced. Accordingly, the use of this terminal device can improve the extensibility of the network.

The invention discloses a task processing method and device, and relates to an automatic driving technology. According to the specific implementation scheme, the method comprises the steps of obtaining a scheduling file, wherein the scheduling file is used for indicating central processing units (CPU) corresponding to various computing tasks; wherein the computing tasks form at least one computinglink, and all or part of the computing tasks belonging to the same computing link correspond to the same CPU; and according to the scheduling file, allocating the various computing tasks to the corresponding CPUs for execution. According to the method and the device, all or part of types of computing tasks on the same computing link correspond to the same CPU, so that the end-to-end processing time delay in the task processing process is relatively short, the time delay jitter is relatively small, and the stable operation of the electronic device is ensured.

The invention controls the up going link and the down going link respectively. The invention is divided into two portions: the up going link control and the down going link control. Both the up going link control and the down going link control include three parts: data reception transmission, data speed control, and data transmission. The invention possesses following advantages: using software to implement data transmission so as to spare dedicated Ethernet data interchange chip (EDIC), and save cost; under condition of less using CPU to accomplish forwarding data in high speed of reaching highest 50Mbps possibly; implementing limited speed, which is unable to be realized by EDIC, with granularity being as 1Kbps; speed control mode with small granularity guarantees stability of data transmission and lesser wobble of time delay.

The invention discloses a priority scheduling method and system for solid state disks. The method includes the steps of by distributing different requests to queues with different priorities, judging whether or not the processing requests finished by current processing queues meet the demands of preset processing capacity values; if yes, conducting circular process on all queues according to the descending order of the priorities. Under different scenes and conditions, the priority of each queue is adjusted and the priority of a most frequent request is adjusted to rank the highest so that delay vibration of users' frequent requests can be decreased; additionally, each priority is assigned with a preset processing capacity value, and therefore requests in the queues with low priorities cannot be delayed for a long time and remain unprocessed. Therefore, the priority scheduling method and system for the solid state disks can preferentially process frequent requests of users according to the preset queue priorities and the processing capability values, reduce delay vibration of the frequent requests, and the requests or operations with low priorities can not be delayed for a long time and remain unprocessed.

An implement method of reservation protocol with multi-services convergence transmission for OBS networks differentially processes the synchronous service flow and the asynchronous service flow, and assembles multiple different types service data into different data burst (DB) by generalized optical-burst paradigm. It functionally expands burst control packet (BCP) and classifies the BCP into two categories: routine burst control packet (R-BCP) and synchronous trace burst control packet (T-BCP). Then it can differentially reserve wavelength channel resource and preempt resource to try to keep the transmission features of synchronous service such as period, low delay jitter and low dropping probability on the base of ensuring the basic QoS requirements of various kinds of service, and realize that a single OBS network efficiently provides asynchronous service and synchronous service.

The invention discloses a delay line structure and a delay jitter correction method thereof. The delay line structure comprises N delay units and N selectors. The output end of the N-1th delay unit isconnected to the first input end of the N-1th selector and the input end of the Nth delay unit, the N-1th selector inputs the N-1th selection signal, and the N-1th selector outputs the N1th selectionsignal; the output end of the Nth time delay unit is connected to the first input end of the Nth selector, the output end of the Nth selector is connected to the second input end of the N1th selector, and the Nth selector inputs an Nth selection signal. The time delay units and the selectors are stacked forwards according to the rule until the input ends of the first time delay units are connected with input signals and the output ends of the first selectors are connected with output signals. According to the structure, delay control can be carried out on the clock at the sending end or the receiving end to meet the requirement of receiving timing, and the jitter of the delay of the delay line can be reduced.

The invention provides a fog computing Internet of Things networking method based on time delay perception. According to the time delay characteristics of the periodic service, the enhanced mobile broadband service and the non-periodic key service in the industrial Internet of Things scene, a fog computing access point (Fog Access Point, F-AP) can flexibly adopt semi-static scheduling, preemptivescheduling and dynamic scheduling. According to the invention, the storage, processing and forwarding capabilities of the F-AP are fully utilized, a queue and a time perception scheduling table are created for each service data packet, aperiodic key services requiring ultralow time delay are forwarded preferentially and can be directly forwarded to an edge server for service processing, and meanwhile strict low-time-delay jitter of periodic services can be guaranteed based on scheduling of time perception. The method can be applied to the scene of coexistence of various time delay demand differentiated services in the Internet of Things, and the time delay and jitter performance of the network are improved.

The invention discloses an implementation method for a broadband mobile intelligent communication network suitable for a high-speed passenger railway line. According to the method, mobile IPv6-access points (MIPv6-APs) serving as wireless access base station devices are arranged along the high-speed passenger railway line, and responsible for bidirectional communication between wireless transceiving routing devices, and meanwhile MIPv6-APs establish connections with the Internet and other private networks via optical fiber and other wired devices. Mobile IPv6-mobile routers serving as MIPv6-MR Mobile wireless routing devices are installed at the head and the tail of a passenger train, and responsible for relaying of data of users in the train and processing the data when a switch occurs on the train. Tunnel connections can be established between the wireless routing devices on the high-speed train for cooperative routing. Meanwhile, a switching mechanism and a routing mechanism of the mobile routers in the train and the base station devices along the railway line are respectively designed, so that quality of service (QoS) of the train network is ensured.

The invention discloses a light-operated semiconductor switch. A shielding ground electrode, a chip semiconductor laser, a laser beam splitting coupler, a large-area semiconductor unit and a shieldinghigh-voltage electrode are sequentially arranged in the light-operated semiconductor switch from top to bottom. An electricity taking module or a boosting module is connected in a gap between the chip semiconductor laser and the laser beam splitting coupler; the side face of the light-operated semiconductor switch is wrapped with an insulating packaging shell, and the insulating packaging shell and the shielding electrode jointly form a light-operated semiconductor switch packaging shell. A power supply and trigger signal interface of the light-operated semiconductor switch extends out of thelight-operated semiconductor switch packaging shell. According to the invention, the light-operated semiconductor switch can be used for various occasions such as a high-power pulse power supply, a compact high-power pulse assembly, small-size high-energy pulse triggering and the like, and has the advantages of high power capacity, high reliability, long service life, small size and the like.