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2471results about How to "Reduce transmission delay" patented technology

HARQ (Hybrid Automatic Repeat Request) signal transmitting method and device and receiving method and device based on polar codes

ActiveCN105743621AIncrease the probability of correct decodingLower the average number of sendsError prevention/detection by using return channelError correction/detection using linear codesCommunications systemComputer science
The embodiment of the invention provides an HARQ (Hybrid Automatic Repeat Request) signal transmitting method and device and receiving method and device based on polar codes. When transmitting is carried out at a time, when it is judged that there are surplus data blocks, one data block is selected out from the surplus data blocks as an initial transmitting information sequence; the combination of first sub-sequences and second sub-sequences corresponding to negative acknowledge signals in a first retransmitting control queue is determined as a retransmitting information sequence, wherein the first sub-sequences and the second sub-sequences are stored in a transmitting cache queue; the initial transmitting information sequence and the retransmitting information sequence are determined as to-be-transmitted information sequences; one first sub-sequence of the determined to-be-transmitted information sequences is stored in the transmitting cache sequence; polar coding is carried out to the to-be-transmitted information sequences; and the to-be-transmitted information sequences are transmitted. The accurate decoding probability of the information sequences failed to be transmitted for former M times is improved; therefore, the throughput of the communication system is improved; the average transmitting and receiving times before the accurate decoding is carried out to the to-be-transmitted information sequences is reduced; and therefore, the transmission delay of the communication is reduced.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Network system of Internet of things and data processing method thereof

The invention discloses a network system of Internet of things and a data processing method thereof, mainly solving the problems of unavailable heterogeneous network integrated access, difficult resource sharing and poor security control of the existing network of Internet of things. The network system mainly comprises an Internet of things processing center, a distributed Internet of things domain processing and servicing subsystem, a multimode Internet of things gateway, and Internet of things devices. The Internet of things processing center provides service and a development platform for the public, the distributed Internet of things domain processing and servicing subsystem assists the Internet of things processing center to provide the service for the user, the multimode Internet of things gateway provides the protocol conversion and the security service, and the Internet of things devices are used to receive and transmit the Internet of things data or to execute instruction, and perform the inter-domain processing or the intra-domain processing on the network data according to different services when processing the network data in the network system of Internet of things. According to the invention, the problem of heterogeneous network integrated access is solved, the resource sharing rate of the Internet of things is enhanced, and the security control of the Internet of things information is strengthened, therefore, the system and the method can be used in designing and building of the Internet of things network.
Owner:XIDIAN UNIV

Intra-cell device to device direct communication method based on user device relay

The invention discloses an intra-cell device to device direct communication method based on user device relay. According to the method, when a first device and a second device in the same cell need to be communicated with each other, if a ProSe server finds the distance between the two devices is too far to meet the distance requirement of device to device communication, the ProSe sends a request message for searching for an available relay device to an eNB (evolved node base) ; after receiving the request message, the eNB searches and feeds a result back to the ProSe server; the ProSe server selects a proper relay device by using the feedback result, and sends a beacon resource request to the eNB; the eNB respectively allocates beacon resources for the first device and the relay device as well as the second device and the relay device, and the relay device and the second device notify the eNB of a communication quality detection result; device to device communication scheduling is performed; after finishing service transmission, the communication devices release the device to device resources. According to the method, the communication is performed in a device to device relay mode, sending power is reduced, user device energy is saved, and the system performance is improved.
Owner:XIDIAN UNIV

Integrated gating active quenching/restoring circuit

The invention discloses an integrated gating active quenching/restoring circuit. The integrated gating active quenching/restoring circuit comprises a quick detection circuit, a pulse generation circuit, a pixel control circuit, a quenching circuit and a restoring circuit, wherein the quick detection circuit is used for processing a detected anode current signal of an SPAD (Single Photon Avalanche Diode) into a pulse signal, the pulse signal can be output through the pulse generation circuit, the pixel control circuit is controlled by an output signal and a gating signal of the pulse generation circuit, the restoring circuit and the quenching circuit are respectively controlled by outputs of the pixel generation circuit, outputs of the restoring circuit and the quenching circuit can be fed back to an anode of the SPAD, and the restoring and the quenching of the SPAD can be controlled. According to the integrated gating active quenching/restoring circuit disclosed by the invention, by adopting a gating control method, the dark counting rate of the SPAD can be effectively reduced, the quenching time can be controlled by the pulse generation circuit, and the integrated gating active quenching/restoring circuit has the advantages of compact area and low power consumption.
Owner:THE 44TH INST OF CHINA ELECTRONICS TECH GROUP CORP

Service data transmission method, system and management control center

The invention provides a service data transmission method, system and management control center. The method includes: the management control center receives the service request initiated by the source terminal under the coverage of the source base station reported by the source base station, the service request includes the source terminal identifier, the service type and the target terminal identifier; the management control center determines the coverage of the target terminal according to the target terminal identifier The target base station; the management control center sends connection establishment signaling to the source base station and the target base station respectively, and the connection establishment signaling includes the address of the source base station, the address of the target base station and the transmission path; the source base station and the target base station establish a data direct connection according to the connection establishment signaling Channel: The source terminal and the target terminal perform business data transmission through the data direct channel. Adoption of the technical scheme of the invention realizes direct transmission of high-bandwidth services, reduces data transmission time delay, and reduces the burden of the core network and the transmission network.
Owner:CHINA UNITED NETWORK COMM GRP CO LTD

Method for setting multilayer satellite network system route

The present invention relates to a method for setting multilayer satellite network system route, including steps of: 1. setting parameters for the network initialization; 2. fixing a time, solving satellite orbit parameters in the interval of time, calculating the location coordinates of the satellite and the length of the link between stars, and establishing a network topological structure; 3. calculating the load of link between stars of the multi-layer satellite network; 4. calculating the process and exchange time delay on stars according to the queuing theory; 5. searching source satellite and object satellite of each satellite layer; 6. selecting the satellite layer for transporting services according to the communication service instruction requirement and network states, and searching an optimum route according to routing algorithm. Relative to traditional stationary orbit satellite, the present invention has small transmission delay, and high validity. The system has advantages of more flexible routing, effective guaranty of service quality, multiple replaceable chain circuits, stronger survivability, a capacity of processing and exchanging on star, optical or microwave links between stars, and capability of providing wideband synthetic service for users in global scope.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Early warning method against vehicle collision based on electronic map

The invention relates to an early warning method against vehicle collision based on an electronic map. The method comprises that 1) GPS data, which comprises movement station information and position information, of a vehicle is obtained, and the position information of the vehicle is converted by a coordinate system and mapped into a two-dimensional rectangular coordinate system; 2) according to historical GPS data of the vehicle, the present position information of the vehicle is optimized in a Kalman filtering algorithm to predict a first present position of the vehicle; 3) according to the historical GPS data of the vehicle, information of the electronic map is combined to predict a second present position of the vehicle; 4) the first present position and the second present position of the vehicle are combined to predict the optimal position of the vehicle; and 5) the predicted optimal position of the vehicle is combined with a TCC algorithm to make early warning against collision. Compared with the prior art, whether the vehicle possibly collides with vehicles in the surrounding is predicted in real time, early warning is given to a driver in real time, the driving safety and the vehicle positioning precision are effectively improved, and the method is practical and efficient.
Owner:TONGJI UNIV

Prediction-based routing method at intersection in vehicle self-organizing network

The invention discloses a prediction-based routing method at an intersection in a vehicle self-organizing network, and mainly solves the problem that when a packet is routed at the intersection, a link is unstable in the prior art. The scheme for implementing the method is that: when the packet arrives at a previous hop node of the intersection, the node predicts the next intersection to which the packet is transmitted; a weight of each adjacent intersection is calculated according to the density of adjacent road sections and a distance from the next intersection to a destination, and the intersection with the largest weight is selected as the next temporary destination for transmitting the packet; and when the packet is forwarded in a greedy mode in the road section, if the selected nodeis positioned in the boundary of the transmission range and is opposite to a driving direction of the transmitting node, a node secondarily nearest to the destination is selected, otherwise the packet is directly forwarded to the selected node. Compared with the geographic routing in city scenarios (GPCR) protocol and the greedy perimeter stateless routing for wireless networks in urban vehicularscenarios (GpsrJ+ protocol), the method has the advantages that: the transmission rate of the packet is increased, the transmission time delay of the packet is reduced, and the method can be applicable to the vehicle self-organizing network.
Owner:XIDIAN UNIV

Uplink receiving method for a base station and uplink transmitting method for a terminal using a shared wireless resource

The invention relates to an uplink receiving method for a base station, comprising: a step of transmitting scheduling information for a shared wireless resource to object terminals to which the shared wireless resource is to be allocated, via a downlink control channel using a scheduling identifier; a step of receiving data from at least one terminal from among the object terminals, via the shared wireless resource allocated by the scheduling information; and a step of transmitting data receipt feedback information for at least one terminal which has received data via the shared wireless resource. An uplink transmitting method for a terminal comprises: a step of receiving scheduling information for a shared wireless resource from a base station via a downlink control channel; a step of transmitting data via the shared wireless resource allocated by the scheduling information; and a step of receiving, from the base station, feedback information which indicates whether or not the data transmitted via the shared wireless resource has been successfully received. Consequently, uplink transmission procedures between the terminal and the base station are integrated and simplified to reduce uplink transmission latency.
Owner:ELECTRONICS & TELECOMM RES INST
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