150results about How to "Reduce end-to-end latency" patented technology

The invention discloses a routing method in a vehicle wireless communication network. The method disclosed by the invention comprises the following steps: route establishment: carrying out a route request and a route response, establishing a fixed node at the crossing, namely an anchor point and establishing an anchor point route on the anchor point; route transmission: carrying out the route transmission by adopting the adaptive broadcasting based on a chain prediction mechanism and a transmission algorithm based on the chain prediction mechanism; and route maintenance. The invention also discloses the vehicle wireless communication network. In the vehicle wireless communication network disclosed by the invention, a wireless communication module loading a special short-distance communication protocol is installed on each vehicle to jointly form a distributed ad hoc network; each vehicle forms a node; a fixed static wireless node is installed at the crossing; the static wireless node serves as the anchor point through the wireless communication module loading the special short-distance communication protocol and is used for assisting the node communication on the route or collecting the information of the crossing; and the anchor point and the nodes on the road jointly form the vehicle wireless communication network.

The invention provides a wireless Mesh intelligent power grid routing mechanism NQA-LB with QoS perceiving and loading balancing. The mechanism comprises four steps: firstly differentiating intelligent power grid service flows with different QoS requirements through an EDCA mechanism, and calculating the frame error rate of different service flows according to the data packet collision rate of the EDCA mechanism; secondly, calculating data packet queuing delay with different priorities of the queue length of forwarding node cache and the successful transmission probability of data packets; then designing the routing metric of QoS perceiving and loading balancing by comprehensively considering the data frame error rate and queuing delay of different service flows, and selecting an optimal path with less load for the service flow with different QoS demands; finally dynamically adjusting the data packet priority on an MAC layer according to network total loading and loading conditions of all priority service flows. The mechanism can more accurately perceive the link quality of the MAC layer, guarantees the QoS demands of different service flows of a power grid, further increases the data packet delivery rate and average throughput capacity, and reduces the end-to-end delay of all service flows.

The invention discloses a wireless internet block control method and a controller therefore based on multipath load balance and relates to the technical field of wireless communication. On the basis of a multipath scheme, an effective grouping transmission distribution strategy is carried out at a sending end to solve grouping disorder (Out-Of-Order, OOO) problems. Parameters are shared among different logistic layers. A multipath shunt strategy is combined, and the block judge of the parameter information of the network layers is combined. In multipath, the ordered grouping distributing strategy of data is guaranteed to enhance the TCP performance of the wireless internet. When a source node detects that a time clock is time out or repeated ACK is not roused by block, a TCP error control module controls a message segment sending module for resending messages. Otherwise, a TCP block control strategy and a block control strategy basing on the prepared path distributing and grouping are adopted for relieving the block. The wireless internet block control method and the controller therefore basing on multipath load balance can be widely applied to wireless Ad hoc network, wireless Mesh network, wireless sensor network, etc.

The invention provides a low-orbit satellite constellation inter-satellite load routing balancing method and system, and the method comprises the steps: dividing the surface of the earth into a plurality of coverage regions according to constellation configuration of a low-orbit satellite, and building a flow model; obtaining potential congestion values of a plurality of coverage areas according to the flow model, carrying out area distribution on an inter-satellite load route according to the potential congestion values of the coverage areas, and collecting, by a whole network information collection module, whole network state information to establish a whole network information base; calculating, by a link cost calculation module, the node transition probability of the inter-satellite load route according to the destination node distance of the inter-satellite load route and the end-to-end link state of the inter-satellite load route; carrying out, by a multi-path calculation module,multi-path search of the inter-satellite load route by taking the path delay of the inter-satellite load route as a constraint to obtain an optimal path of the inter-satellite load route and alternative paths of the inter-satellite load route; and selecting, by a multipath forwarding module, the next hop of the inter-satellite load by using a traffic light strategy according to the current network state in the forwarding process of the inter-satellite load.

The invention discloses a statistical priority multiple access method for a high time-sensitive service. According to the method, it is assumed that a physical layer adopts frequency hopping and timehopping communication technologies, and frequency hopping and time hopping patterns are distributed to nodes firstly according to the network scale and service transmission requirements; The service load value of the logic channel corresponding to the frequency hopping and time hopping pattern is obtained by detecting the occupation condition of the pulse time slot, and the transmission thresholdvalues of various priority services are calculated by adopting a filling test method. And at the beginning of each network time frame, the sending node sequentially checks whether to-be-sent data packets exist in the network layer queue according to the priority order, and compares the service load values of the frequency hopping and time hopping patterns of the receiving nodes of the data packetswith the sending threshold value of the priority service. And if the service load value is smaller than the sending threshold value, the node can send the data packet with the priority according to the frequency hopping and time hopping pattern of the receiving node. A simulation result in an EXata network simulation environment proves that the method can reliably support transmission of the high-time-sensitivity service.

The invention discloses an MAC access method based on a terahertz ultra-high-speed wireless network. The method includes the following steps that a Beacon1 frame is broadcasted by a PNC at the Beacon1 period; timeslot applications of DEVs are received by the PNC at the CAP period or SAP period; timeslots are distributed and distribution results are broadcasted by the PNC at the Beacon2 period; after a Beacon2 broadcast frame is received, data transmission is carried out in the timeslot, of each DEV of the CTA timeslot, in the CTAP time frame in the TDMA mode; afterwards, operation in the superframe is finished, and operation in the next superframe is carried out. The MAC access method based on the terahertz ultra-high-speed wireless network solves the problems of redundant control expenses and data transmission time delay of existing relevant MAC access methods and timeslot resource waste.

The embodiment of the invention discloses a method for realizing neural network model splitting by using a multi-core processor and a related product. When operators capable of being split exist in the neural network model, the operators are split, and the optimal splitting combination is selected to obtain the optimal splitting result of the whole neural network model, and then the sub-operatorscorresponding to the optimal splitting result are executed in parallel through multiple cores, and the purpose of reducing resource consumption of computer equipment is achieved.

The invention discloses a control method of wireless streaming media adaptive mixing FEC / ARQ based on Kalman filtering, belongs to multimedia communication adaptive error control field in wireless dynamic network. The method uses cross-layer design and uses Kalman filter to predict current network status (packet loss ratio) in data link layer, adaptively regulates forward error correction (FEC) parameter of link layer and automatic repeat request (ARQ) parameter of link layer; on the other hand, uses adaptive FEC strategy in application layer, adaptively regulates sending speed of video frame according to current network status, and distributes network bandwidth dynamically between the video source data and the redundant data. The invention provided method can make receiver obtain maximum playback frame rate and improves reliability and real time of streaming media transmission effectively.

The invention provides an OLSR routing method based on mobile prediction and time delay prediction. The method comprises a cluster member node routing table calculation process and a cluster head noderouting table calculation process, and the cluster member node routing table calculation process comprises the following steps: establishing a mobile prediction model by adopting a Kalman filtering algorithm, and selecting an adjacent node with high stability as a next hop node through the model so as to establish an intra-cluster member node routing table. The calculation process of the clusterhead node routing table comprises the following steps: taking the queuing time delay of the data packet on the MAC layer of the cluster head node as a measurement factor of routing selection, establishing a prediction model of the queuing time delay through an ARMA algorithm, and calculating the routing table of the cluster head node by using the model. According to the method, the problem of unstable routing caused by high-speed movement of member nodes in the cluster can be weakened, meanwhile, the probability of network congestion of the cluster head node is reduced, the robustness of routing is improved, and the end-to-end time delay is reduced.

The invention discloses an improved-transmission control protocol-friendly multicast congestion control (TFMCC)-protocol-based communication method, which is implemented by the following steps of: every time when a source receives a feedback data packet from a current limiting receiver (CLR), computing end-to-end one-way delay jitter between the source and the CLR according to effective timestamp information in the feedback data packet, and computing a congestion judgment factor by utilizing the delay jitter to judge congestion; and computing a correction factor by utilizing the congestion judgment factor to regulate expected throughput and further regulate a transmission rate. In the method, the transmission rate is regulated by calculating the end-to-end delay jitter between the source and the CLR as a congestion signal, and the end-to-end delay jitter of a TFMCC protocol is effectively controlled, thereby effectively reducing the jitter of the protocol, average end-to-end delay, average end-to-end delay jitter, an average packet loss rate and the like, improving the stability and overall performance of the TFMCC protocol, and making the protocol better serve a multicast protocol and more suitable for the transmission of multimedia services.

The invention provides a vehicle routing protocol method with stability-based clustering in an urban environment. The method comprises approximate node clustering set formation, cluster head election and cluster maintenance. The approximate node clustering set formation means exchanging state information between adjacent nodes with the same moving direction through Beacon messages, modeling the randomly changing moving speed as a normal distribution model, forming an approximate node clustering set after excluding nodes which are greatly different from the whole in speed, and establishing and updating an approximate node table; the cluster head election means remodeling the speed, locations and adjacent node quantity of nodes in the approximate node table as a normal distribution model, and choosing the optimal cluster head node by calculating competing priorities; and the cluster maintenance means specifically processing joining / separation of nodes into / from clusters and combination of the clusters to guarantee the stability of the clusters. The cluster mechanism of the method owns a smaller cluster head change rate and a longer cluster head maintenance time; and the packet delivery ratio is effectively improved in the urban environment, and the delay is also effectively reduced in the urban environment.

The invention discloses improved AODV routing protocols adaptive to different motion scenes. The invention is characterized by comprising the steps of (1), performing routing discovery; (2), performing routing selection; (3), performing routing activation; and (4), performing routing maintenance. By means of the improved AODV routing protocols disclosed by the invention, the average relative motion speed of various unmanned aerial vehicles and adjacent unmanned aerial vehicles can be obtained through GPS signals carried by the various unmanned aerial vehicles, so that the change speed of a network topological structure is judged; different routing protocols are selected by judging the change speed of the network topological structure; namely, different improved AODV routing protocols are selected according to the average relative motion speeds of the unmanned aerial vehicles; the improved AODV routing protocols can be adaptive to the converted topological structures of the unmanned aerial vehicles; therefore, the network bandwidth is reduced; the end-to-end delay is reduced; and the packet loss ratio is reduced.

The invention belongs to the technical field of satellite network communication, and discloses a Walker constellation-oriented Mobius constellation topological configuration construction method, system and application. According to the implementation scheme, the method comprises the following steps: initializing parameters of Walker constellations and satellite antenna link establishment constraints, and numbering all satellites; according to the constellation parameters and the link establishment constraints, calculating a link establishment set of each satellite; searching a link establishment mode capable of establishing a Mobius constellation topological structure in the different-orbit link establishment set, and generating a link combination set; and establishing an in-orbit link andan out-of-orbit link of the Walker constellation according to the link combination set, and constructing a Mobius constellation topological structure. According to the method, the average path hop count of the satellite network is shortened, the connectivity of the network is enhanced, the average end-to-end delay of the network is reduced, and the information bearing capacity of the Walker constellation space segment is improved. According to the invention, a topology structure with optimal connectivity of the Walker constellation in a one-satellite four-chain mode is provided, the routing cost is reduced, and the cost performance of the network is improved.

The invention discloses a wireless router active queue management method based on rates and a queue length. The wireless router active queue management method adopts the following four modules in total, namely an enqueue module, a dequeue module, an update module and an abandon module; a packet dropping probability is controlled and regulated according to enqueue rate and dequeue rate estimated values of a buffer and a queue real-time length of the buffer; and packet dropping probability update time is also regulated by utilizing enqueue rate and dequeue rate estimated values of a cache region. The wireless router active queue management method has high adaptability and robustness, and has the characteristic of reducing the end-to-end delay under the condition of ensuring a high link utilization rate in a dynamic complex wired-wireless heterogeneous network environment.

The invention provides a various internets of vehicles integrated vehicular system. The system is characterized by comprising a DSRC communication module, an LTE-V communication module, a data processing module and a positioning module. The DSRC communication module is used for carrying out vehicle-to-vehicle communication and receiving driving information and traffic management information of a current vehicle and surrounding vehicles. The LTE-V communication module is used for carrying out vehicle-to-road communication, receiving the driving information of the current vehicle and receiving the traffic management information of road-side units. The data processing module is used for calculating the driving information and the traffic management information received by the DSRC communication module and the LTE-V communication module. The positioning module is used for positioning the vehicle in a double-mode positioning mode. According to the system, through integration of DSRC and LTE-V Internets of vehicles, learning from each other is carried out, and advantages of the two technologies are utilized fully; the vehicle-to-vehicle communication is established based on the DSRC; the vehicle-to-road communication is established based on the LTE-V; under the condition of saving investment, the Internet of vehicles is established; the road safety level is improved; and the trip experience is improved.

The invention discloses a medium access control method based on a CDMA underwater acoustic network for improving the network throughput, shortening end-to-end time delay and reducing the energy consumption so as to prolong the service life of the network. The invention adopts a CDMA access mode and a distributed power control technology, and nodes participating information transmission dynamically adjust data sending power according to network conditions on the premise that the nodes do not influence the normal sending and receiving of adjacent nodes so as to overcome the near-far effect existing in a CDMA system. Meanwhile, the invention improves a handshake mechanism in a traditional medium access control method, uses a data pocket to replace an ACK as a response for successful interaction in case of satisfying special conditions and can obtain higher performance under the conditions of different network loads so as to be effectively applied to reliable data transmission in the underwater acoustic network.

The invention discloses a user collaboration method of joint network coding and channel coding. Each user owns at least one partner user; each user connects the self-information with the information of each partner users in series for forming a longer information sequence; the channel coding is carried out on the sequence, and the coded data is broadcasted, and the network coding is realized; a base station obtains the information of the users by joint iterative decoding according to the original data broadcasted by the users and the data after the joint network coding and channel coding. As the network coding joints information bits of a plurality of partner users together, the collaboration stage of the user collaboration method with joint network coding and channel coding only occupies one half of timeslot of the traditional space-time coding collaboration proposal, thereby reducing the end-to-end time delay and improving the transmission efficiency.

The invention discloses a service function chain cross-domain arrangement method for end-to-end delay performance optimization. The method comprises the following steps: S1, an advanced arranger responds to a service request of a user or a network administrator, and describes the service request as a service map with a weight; S2, the advanced arranger divides the service map into a plurality of sub-service maps with weights and allocates the plurality of sub-service maps to corresponding sub-network domains; S3, a low-level arranger in the sub-network domain performs intra-domain arrangementmapping on the received sub-service map and sends an intra-domain arrangement mapping result to the advanced arranger; and S4, the advanced arranger receives the intra-domain arrangement mapping result and judges whether the sub-service map is successfully mapped, if so, the advanced arranger terminates the processing, or otherwise, the advanced arranger executes S2 again. According to the servicefunction chain cross-domain arrangement method provided by the invention, the abundant available resources of a cross-domain network are can be fully utilized to meet the resource requirements of thenetwork service, and meanwhile, the end-to-end delay of the network service in the cross-domain network is minimized, thereby effectively improving the service experience of terminal users.

The invention discloses a layer-crossing coordinating route method for supporting multiple speed rates in the Ad Hoc network, which relates to the technical field of the radio communication. The steps are following: after the high layer date generating, the network layer searching whether the data achieve the effective route of the purpose note; if the data exists, skipping to the next IP address and the delivering the data frame to the ARP layer; otherwise, the network layer builds the route according to the long-skipping route principle, delivering the next IP address and the data frame to the ARP layer; ARP layer addressing the corresponding address and data conversion to the MAC layer frame; MAC layer first node to find whether there is synergy, if there is, MAC layer MAC synergistic way of transmission, if there is, MAC layer transmitted using DCF. The invention enlarges the probability of the coordinating node by the long-skipping route principle in the building of route, and via the use of collaboration technology, will be included in each routing of a low-speed long-distance high-speed link into two shorter links, so as to more effectively support multi-rate transmission and improve network performance.

The invention discloses a coding-aware wireless mesh network multi-path routing method for avoiding congestion, and belongs to the technical field of wireless communication. The coding-aware wirelessmesh network multi-path routing method comprises operations in two stages of routing and data transmission, and adopts two new mechanisms: a congestion aware mechanism and a multi-path dynamic flow distribution mechanism; in the route discovering process, nodes of which node cache occupation rates exceed a threshold are used as high-load nodes, the high-load nodes do not need to forward a newly received routing request message, meanwhile, forwarding of adjacent nodes of the nodes for the routing request message is also reduced, and paths in a plurality of paths from a source node to a target node, on which the high-load nodes exist, are eliminated in advance, so that routing cost is effectively reduced; and in the data transmission process, the source node can carry out regulation on a flow distribution ratio according to load conditions of the nodes on each path, so that network congestion is avoided, and end-to-end delay can be reduced.

The embodiment of the invention discloses a method for realizing neural network model splitting by using a multi-core processor, and a related product. When operators capable of being split exist in the neural network model, the operators are split, an optimal splitting combination is selected to obtain the optimal splitting result of the whole neural network model, then the sub-operators corresponding to the optimal splitting result are executed in parallel through multiple cores, and the purpose of reducing resource consumption of computer equipment is achieved.

The invention discloses a transmission control protocol (TCP) congestion control mechanism VC-TCP (vehicular cross-layer transmission control protocol) based on cross-layer design in a vehicle communication network and relates to the wireless communication field. In the invention, a network layer is combined with a transmission layer so as to perform cross-layer optimization. Firstly, useful vehicle operation information is provided for the network layer so that the network layer can predict a channel state in a routing process. Then a VC bit is added in a TCO header and is used to indicate the channel state. The network layer records the channel state in the VC bit through cross-layer communication. A TCP sending terminal rapidly distinguishes a packet loss reason according to the VC bit. Finally, based on a four state transfer diagram of the cross-layer design, a traditional TCP congestion control algorithm is improved and different congestion control strategies are used in different packet loss situations. By using the method of the invention, TCP transmission performance in the vehicle communication network can be improved. Advantages are obvious especially under the conditions of high speed mobile of a node, frequent change of topology and bad channel quality.

The present invention relates to the communications field, and discloses a data flow control method and system. The method includes the steps of calculating a data flow table request amount of each switch node in a software-defined network (SDN); and optimizing a weight of each link in the SDN according to a convergence cost of each switch node and the data flow table request amount of each switch node, so as to balance data flows of all switch nodes. According to the data flow control method, routing optimization is performed on the network data flow, so that load balancing among switches in the network is realized, a limited flow table processing capability and a flow table cache space are fully used, and the use efficiency of network resources is improved.

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 provides a method for managing traffic streams used in mobile internet. Under the precondition that compatible standard moves IP protocol, mobile nodes are permitted to be out of the home proxy and main home address, at the same time, a plurality of distribution-typed home proxy server DHPs and distribution-typed home address DHoAs exist, and the position management in which the traffic stream is taken as granularity and the transmission route control are realized. MN can select DHP for different traffic streams dynamically, the DHP which provides service for each traffic stream is selected near a communication node of the corresponding opposite end, therefore, end-to-end delay in the communication of the mobile node and the communication node of the opposite end is shortened effectively. MN realizes the switching in which the traffic stream is taken as granularity and transmission route control in the process of movement. The introduction of DHP greatly reduces the dependency on HA by MN, thus not only reducing the congestion in home network and HA load, but also reducing the influence on MA by the possible failure and fault on the home network and HA, at the same time, the network domain in which CN is located can monitor and control the traffic streams conveniently.

The method features: in term of the predetermined amount of active sessions, target value of queue length, link capacity and length of small queue within the range of round-trip delay, a sliding mode variable structure control system having a sliding mode parameter Omega=2, which adopts a combination of ratio control and constant-value control, are used to control the discarding probability of packet.

The invention discloses a multi-mode switching type Internet of Vehicles routing method. The method comprises the following steps that: an RSU node performs switching judgment according to the sendingcondition of a data packet of the RSU node and the use condition of a cache stack, and performs switching among a V2I2V greedy forwarding mode, a prediction+copy transmission mode and a load balancing mode. According to the invention, the RSU wired network is utilized to assist in delivering the inter-vehicle multi-hop message. The load balancing according to the residual survival time of the data packet in combination with the estimated waiting time in the RSU message waiting queue, the data packets originally gathered in the heavy-load RSUs are shared to each light-load RSU, so that the network pressure of the heavy-load RSUs is reduced. The overtime packet loss caused by long-time waiting of the data packets in a message waiting queue of the heavy-load RSUs is avoided. Meanwhile, threeworking modes are designed for the RSU, so that the routing protocol can adapt to working environments with low vehicle node density and high vehicle node density. The end-to-end time delay of Internet of Vehicles routing is reduced, and the delivery rate is improved.

The invention relates to a multipath routing method based on link lifetime and energy consumption prediction, belonging to the field of Internet of Things, and the proposal of a multipath routing protocol saves the overhead of route discovery. In the route discovery phase, LLECP-AOMDV method performs hierarchical processing according to the energy level. When the node energy is lower than the threshold value, the LLECP-AOMDV method no longer participates in the route discovery process. According to the lifetime of the routing link and the minimum energy consumption of the routing path, the routing path with higher priority is selected for data transmission. In the route maintenance phase, the priority is updated dynamically by sending HELLO packets. Compared with AOMDV, AOMR-LV and FF-AOMDV, the LLECP-AOMDV method improves the lifetime of the network, reduces the energy consumption, and reduces the average end-to-end delay.

The invention relates to a coordination mechanism method of multiple-hop underwater acoustic network data transmission and belongs to the underwater communication field. According to the method, a coordination mechanism of inter-node data transmission is established based on the transmission characteristic of large time delay of an underwater acoustic channel; the length of data blocks is set reasonably, the distances between nodes are controlled, and the magnitude of transmission power of each node is controlled; and after a node i sends a data block j, the next data block j-1 of a node i-1 is received at first, then the feedback signals from a node i+1 are received, if acknowledgement signals are received, the node i directly begins sending the next data block j-1 from the node i-1, otherwise, the node i re-transmits the original data block j, and thus, the listening state time of the node i can be fully utilized. With the method of the invention adopted, the average end-to-end delay of the transmission of an underwater acoustic data multiple-hop transmission system can be effectively reduced with the bit error rate performance of the underwater acoustic data multiple-hop transmission system ensured; and underwater acoustic data are sent and received by using the idle time of the listening of the underwater acoustic network nodes; and the average end-to-end delay changes slowly with a signal to noise ratio.

The invention belongs to the technical field of wireless sensor network communication, and provides an RPL routing method based on bidirectional father node decision. The RPL routing method comprisesthe following steps of: selecting an optimal father node according to routing metrics of all candidate father nodes by a child node; after consulting information is carried through an M-DAO message and the optimal father node receives the M-DAO message transmitted by the child node, judging whether to establish connection with the child node or not according to the information carried in the M-DAOmessage and the current network condition of the optimal father node; and finally, completing networking. According to the RPL routing method, the optimal father node is selected through an optimal father node selection mechanism, so that the probability that the node with heavy link load is selected as the father node is avoided, and meanwhile, a large number of child nodes are prevented from being connected to the node; and secondly, through adopting the bidirectional father node decision mechanism, the data processing capacity of the father node is considered, and the thunder effect causedby the fact that DIO messages cannot finally reflect the connection condition of the node is relieved.