47results about How to "Guaranteed transmission delay" patented technology

The invention discloses a multi-service scheduling method, which comprises the following steps: A, calculating a service transmission rate in a certain time period prior to a current scheduling time slot, counting packet loss of L2 packets and waiting time lengths of first packets of services, and then calculating scheduling priorities among the services; B, acquiring the service with the highest priority from a scheduling queue and allocating resources for the service through a GBR token bucket if the service is determined as a GBR service; and C, updating available resources, continuing allocating resources for the GBR service through an MBR token bucket if the available resources are determined to be not null, and combining the resources allocated for the service respectively through the GBR token bucket and the MBR token bucket. The invention simultaneously discloses a multi-service scheduling system. The method and the system fully consider the Quality of Service QoS attribute of the service, and meet the GBR requirement of the service at the same time of avoiding the occurrence of a 'hunger' situation.

This invention provides one method for cross H-ARQ and wireless dispatch formula based on terminal feedback, which is characterized by the following: mobile terminal feeds back the right or wrong information to base station and the current buffer size information to the base station; base station receives ration feedback information combined with business service quality, buffer business volume to determine materials align priority for materials transfer; terminal feedback volume information is fed back to station through determination or not information to simplify the transmission design of information.

A method, a system and a device for video data transmission, and a photographic apparatus, said method comprising: collecting an image according to a predetermined frame collection rate, the frame collection rate being greater than a frame display rate at which a display device displays a video image; performing frameskip processing on the collected image to obtain a target video image frame; performing an encoding processing on the target video image frame so that the frame rate of the encoding output is equal to the frame display rate; and sending to the display device the encoding-processed target video image frame. The invention increases the real-time performance of video data transmission by means of collecting a video image at a frame collection rate that is higher than the frame display rate so that the transmission delay of the video data from an aerocraft end to a display end is reduced by reducing the collect delay.

The invention discloses a GPU box PCIE extended interconnection topology device. The device comprises a GPU box, wherein the GPU box comprises eight groups of interconnected GPUs, a CPU server connected with the GPUs and a PCIE switch module; the PCIE switch module installs a high-speed interconnected cable card through a PCIE slot to realize interconnection among different GPU boxes; the GPUs areconnected through the PCIE switch module; the CPU server is connected with the GPU box through a PCIE link; the PCIE switch module extends the PCIE link into eight groups of PCIE X16 links to realizeconnection between the CPU server and the eight groups of GPUs. Through the device, independent design of a standard PCIE interface GPU box is realized, maximization of GPU performance is guaranteed,transmission delay is short, extensibility is good, flexible configuration and matching usage can be realized, and GPU box design needed for high performance and artificial intelligence is provided.

The invention discloses a 1.8GHz-based TD-LTE (Time Division Long Term Evolution) system used for subway rail communication, relating to the field of subway rail communication. The TD-LTE system comprises an EPC (Evolved Packet Core), vehicle-mounted terminal equipment and a plurality of LTE base stations, wherein the TD-LTE system works in a 1.8GHz frequency band; the EPC is connected to a CBTC (Communication Based Train Control) system on the ground; the LTE base stations are distributed along a subway rail line and are connected to the EPC through optical fibers after passing through switches; the vehicle-mounted terminal equipment comprises front LTE CPE (Customer Premise Equipment) and rear LTE CPE, wherein the front LTE CPE and the rear LTE CPE are both connected to the vehicle-mounted CBTC system and are connected to the LTE base stations through a wireless network. The TD-LTE system utilizes the special 1.8GHz frequency band, so that a problem of radio interference is avoided from the source, the driving operation safety is guaranteed to the greatest extent, and meanwhile, the future rail transit development trend and the long-term benefit of the operating unit are both considered.

The invention provides a routing method for a wireless multimedia sensor network distinguishing service in a coal mine. The method comprises the following steps of: by a cluster head node, establishing a total QoS evaluation function of a sensing data service, a voice data service and a video data service by using a linear weighting method according to the WMSNs transmission delay, the transmission packet loss rate and the transmission energy consumption of the paths corresponding to the sensing data service, the voice data service and the video data service; according to the priority of the sensing data service, the voice data service and the video data service, respectively calculating the best paths corresponding to the sensing data service, the voice data service and the video data service by using a differential evolution algorithm based on the maximum constraint value of the total QoS evaluation function. The invention realizes three node disjoint paths for three multimedia services, realizes differentiated services of the three multimedia services in the coal mine, and guarantees different requirements of service quality of the three multimedia services for transmission delay, transmission loss rate and transmission energy consumption.

The utility model discloses a user access method of the HSDPA system, which is as follows: the service quality state in a district is detected based on the service quality information of connected users in the district required for access by HSDPA users; if the service quality state in the district meets the access qualification, HSDPA resources are allotted to the users requiring for access; otherwise, the users are rejected to access. The utility model adopts the indicators such as time delay and the data quantity in postpositional memory zones that are directly related to the service quality of data users as the criterion for user access, and can finish part of the judgment work by Node B to reduce the burden of RNC. The utility model reduces packet loss rate while ensuring the service quality of the users, and improves the user satisfaction degree.

The invention provides an energy router modeled on the basis of multiple intelligent agents and an energy dispatching method thereof. The energy router comprises an energy control unit, an energy transfer unit, an energy conversion unit, an energy storage unit and a communication interface unit, wherein the energy control unit is used for forecasting the energy load according to user needs, optimizing the energy dispatching, obtaining the dispatching optimization information of the input energy, and transferring the dispatching optimization information to the communication interface unit; the energy transfer unit is used for transferring the energy selectively input in the dispatching optimization information of the input energy to the user load, the energy conversion unit or the energy storage unit; the energy conversion unit is used for converting the input energy to the other kind of required energy to be transferred to the user load; the energy storage unit is used for storing electric energy and heat energy; and the communication interface unit realizes communication among the energy control unit, the energy transfer unit, the energy conversion unit and the energy storage unit.

The invention discloses a reliable communication method based on adaptive power control (APCRC) for a vehicle area network, belonging to the field of digital communication. In a traditional routing protocol, a vehicle adopts a fixed transmission range, but the vehicle density in a vehicular ad-hoc network changes rapidly due to high-speed movements of vehicles, the invention proposes an APCRC fora vehicle area network in order to select different transmission range and transmission power in different time. In the method provided by the invention, the communication time of vehicles-to-vehicles(V2V) communication links is calculated at road sections and road intersections according to directions of vehicle speeds, timers of neighboring nodes are set according to reliability of links of thenodes, geographical advancing distances, the sizes of contention windows, and so on, routing decisions are made, nodes having higher priorities have shorter waiting time, and the node having the highest priority among all neighboring nodes will send a data packet first to ensure the success rate of data packet delivery during V2V communication.

This invention provides a method for power-efficient transmission supporting integrated service over WLAN. The said invention combines the polling-based and the contention-based mechanisms, named on-demand polling (ODP). In the ODP scheme, a voice station is in the polling list when it is in the active mode. During the idle mode, it is configured to operate in the sleep mode for saving power. Also, it adopts the contention-based mechanism to join the list again while returning from the idle mode. On the other hand, the data station adopts the contention-based mechanism to transmit its packets over WLAN. In addition, to achieve service differentiation, the said invention also employs a prioritized access probability for voice over data services. Simulation results show that the said invention can reduce the power consumption for voice stations and enhance the throughput for data stations.

The invention discloses a selection method for a routing backbone path based on network connectivity. The method specifically comprises the following steps: step 1, calculating the assistant connectivity probability from a source node to a destination node according to vehicle location information within the jurisdiction by a gateway; step 2, calculating the end-to-end delay d by the gateway; step 3, calculating the route hops H by the gateway; step 4, calculating a bit error rate BER by the gateway; step 5, taking the assistant connectivity probability as a target function, taking the delay, the hops and the bit error rate as constraint conditions, and forming an optimization problem; step 6, using a routing genetic algorithm to obtain an optimal solution, that is a backbone route; step 7, adding the optimal solution to the header of a data packet; and step 8, if the thresholds Dth, Hth and BERth corresponding to the end-to-end delay d, the route hops H and the bit error rate BER required by QoS are invariable, then returning to step 7, otherwise, returning to step 1. A crossroad based routing mechanism proposed by the invention guarantees the transmission delay, bit error rate and other QoS indexes by a higher network connectivity probability.

A compatible network high real-time data transmission device and method, comprising a data link layer and a physical layer of an OSI system, the data link layer comprising an MAC client support preemption function module, an MAC control module and an MAC merging module, the physical layer comprising a coordination sublayer module and a PHY module, the method comprises the steps of slicing of low-priority data, packaging of low-priority frames, slice combination and combination verification, and can improve the processing compatibility of equipment of different manufacturers and data of different priorities through a frame preemption function of authentication equipment; according to the method, the overhead time for generating frame preemption in the transmission process of the high-priority data frame is effectively reduced, the large-bandwidth data flow transmission requirement in a network is effectively improved, the high-real-time transmission of discrete data is met, and the production efficiency of equipment is improved.

The invention provides a multilayer video transmission peak value removing method and system in a cloud conference and a storage medium, and the method comprises the steps: carrying out the initialization of a multilayer video, carrying out the reasonable control of each layer of coding frame according to a set code rate and an initialization wrong frame parameter of each layer, uniformly staggering an IDR frame with the maximum data size in each layer of video, and meanwhile, by adopting a method of dynamically adjusting a frame staggering interval, reducing and eliminating the possibility of code rate peak value occurrence at a multi-layer video coding end under the conditions of not reducing video quality, not increasing video delay and not reducing video continuity, so that the interaction with back-end transmission is simplified, a transmission layer flow control algorithm is combined, stable transmission of multi-layer video streams is realized, and the reliability of wide area internet video communication and the user experience are improved.

A method for using dual-mode 1X/DO terminal to send and receive high-speed grouped data service HRPD message comprises that a 1X/DO terminal residential in a code division multiple access CDMA 2000 1X network sends a HRPD message, setting a message packed with the object HRPD message, sending the set message to the CDMA 2000 1X network or an independent logic network unit which analyzes received message to obtain a HRPD message to be sent to the HRPD network, and when the 1X/DO terminal residential in a code division multiple access CDMA 2000 1X network receives the HRPD message, the CDMA 2000 1X network or independent logic network unit packs the HRPD message at HRPD network into the set message to be sent to the 1X/DO terminal via an idle port of the CDMA 2000 1X network. The invention can send and receive HRPD message in CDMA 2000 1X network, with confirmed transmission time delay and transmission safety.

The invention discloses a limited retransmission data transmission method for a wireless link control layer, and relates to the field of wireless mobile communication. The invention provides the limited retransmission data transmission method for optimizing an AM (Amplitude Modulation) mode of an RLC (Radio Link Control) layer, which is characterized in that an overtime control flow, a receiving window control flow and a sending window control flow are added on the basis of the AM mode of the original RLC layer. The retransmission function is reserved, and most data of the transmission delay is ignored, so that the purpose of ensuring that the transmission delay is within an acceptable range while the communication service quality is improved is achieved.

The embodiment of the invention discloses a link aggregation transmission method and device, a terminal and a computer storage medium, and the method comprises the steps: obtaining a to-be-transmittedmessage, and determining a corresponding message group according to the message type of the to-be-transmitted message; determining a matched transmission channel according to the message group, wherein the transmission channel comprises a first transmission channel and a second transmission channel of which the transmission delay is greater than that of the first transmission channel; and sendingthe message group to a receiving end through the matched transmission channel.

The invention discloses a link adaptive method for a grant-free uplink transmission, and belongs to the field of mobile communication. The method includes the following steps: a base station dividing transformats that are available to a system into N ranks, the base station configuring N interactive orthogonal resources in the PSCCH for transmitting transformat indication; after a certain user successfully transmits data in an uplink, the user transmitting an indicating signal in the resource corresponding to the transformat which is employed in the transmission, performing monitoring, and once the indicating signal of the transformat at any position is detected, at least recording the transformat and the intensity of the signal, and the time of the appearance of the signal; when the user conducts grant-free uplink data transmission, based on the intensities and time of appearance of the indicating signals of respective transformats, selecting the transformat employed in the data transmission. According to the invention, diversity technology is employed in transmission technology to overcome the difference of small-scale fading of the channel, so that the method herein is more effective in increasing the accuracy of link adaptivity.

The invention discloses a business processing method and device, and belongs to the technical field of communication. In the embodiment of the invention, after a second message is received and the second message is not sent out, if the first message is received again, a forwarding node can determine the sending sequence of the two messages according to the current urgency degree information of thetwo messages at the current node, wherein the current urgency degree information is used for indicating the forwarding emergency degree of the corresponding message at the current moment. Then, the forwarding node can send the two messages according to the determined sending sequence. Therefore, according to the business processing method provided by the embodiment of the invention, the requirement of the time-sensitive business on the forwarding time delay can be met without strict cooperation and accurate cooperation between the sending node and the forwarding node, and the implementation difficulty is reduced.