47results about How to "Improve packet loss rate" patented technology

The utility model discloses a network data processing method and device; wherein, the method comprises: a plurality of input ends are configured with priorities; input data from the input ends with priorities or high priorities is exchanged and processed first according to the priorities of the input ends; data exchanged and processed is exported; the network device comprises: a priority configuration module, which configures priorities or high priorities to the input ends with smaller bandwidth or more important input ends; a data exchange module, which exchanges and processes input data from the input ends with priorities first; an output module, which exports exchange data. The utility model is applicable to the network device with important input ends to improve the transmission speed and quality of data from the important input ends.

The invention relates to an Aloha enhanced access method for a low-orbit constellation system, belongs to the field of satellite communication, and is used for solving the problem of quick access whena high-dynamic terminal communicates with a new generation of low-orbit constellation system. The method comprises the following steps: firstly, constructing a system satellite access system model; reserving different numbers of channels for users with different priorities of the related high-dynamic terminals in advance; when the user terminal has an access demand, calculating the specific moment of sending the data packet by utilizing access control; when the data packet is sent, enabling the user terminal to divide a channel into time slots by utilizing a local clock and randomly puts thedata packet into the time slots to be sent; finally, utilizing the characteristic that the user terminal is covered by multiple satellites of the system in the communication process, wherein after receiving the data packet, each receiving end satellite forwards the data packet to the low-orbit constellation system for interference elimination until all the data packets are successfully decoded orthe maximum number of iterations is reached. According to the method disclosed in the invention, the throughput rate and packet loss rate indexes of the system can be optimized, the resource utilization rate is improved, and the first access success rate of the high-dynamic terminal can be optimized.

The invention relates to an interference sensing cross-layer routing method based on node sending and receiving capacity. The method defines parameters for judging the sending and receiving capacity of a node based on an 802.11 medium access control (MAC) layer, and the two parameters can reflect that strength and weakness of interference of the periphery of the node and communication load degree born by the node, based on the fact, a MAC layer and a network layer are combined and a new routing criterion is defined, the new criterion is related to the number of surrounding active neighbor nodes, the number of data flow passing the nodes, capacity of node access channel and topology changing conditions around the nodes, and real conditions of the network can be further reflected. The interference sensing cross-layer routing method based on the node sending and receiving capacity aims to reduce interference, selects a path which is largest in bottleneck node comprehensive capacity or a path which is smallest in bottleneck link interference as far as possible, and the path which is largest in the bottleneck node comprehensive capacity or the path which is smallest in the bottleneck link interference is used as routing, and therefore average end-to-end delay and packet loss probability are reduced, and the throughput is improved.

The present invention is based on the dynamic routing method of the three-dimensional heterogeneous network in the emergency scene of the UAV. The method can adapt to the fusion network of dynamic topology changes, and the UAV is used as the relay node to form the relay node, and the nodes in the same area do not communicate. , the node communication in different areas is routed through the UAV node relay, and the ground node is only used as the end node in the route. In each communication process, the method includes the following steps: Step A: respectively Nodes model the scene; step B: improve the link weight on the basis of the traditional OLSR protocol, and select the routing path as cost=α×ETT+β×E i +(1‑α‑β)×T as the benchmark; Step C: The core idea of ​​the OLSR routing protocol is to select the MPR set to reduce routing overhead. The improved LBMRE‑OLSR abandons the classic MPR set selection algorithm, The selection of the MPR set is based on the node's expected transmission time, node energy and node congestion degree.

An adaptive service data distribution method based on opportunistic communication in the Internet of Vehicles environment. Adjacent vehicles or RSUs receive Beacon messages to judge the validity of the messages. If the forwarding conditions are met, the expected forwarding delay is calculated and the expected forwarding delay value is added to the field. Return RREP. After the last hop vehicle or RSU receives the RREP from its adjacent object, it executes the RREP response processing process and returns RREQ to the optimal next hop selected from the candidate object set. After receiving the RREQ, the candidate object judges whether All data packets arrive at the target location, if not all reach the target location, the forwarding vehicle or RSU will restart a new round of broadcasting until all data packets reach the target vehicle. The invention realizes the effective distribution of service data in the Internet of Vehicles environment, and improves the packet loss rate, reduces the number of retransmissions, delay and network overhead and other network performance under the condition of ensuring that other indicators are not damaged.

The present invention provides a cross-layer vehicle network routing method based on a link transmission capacity. In a vehicle network city scene, the method combines an existing MAC layer access protocol to reflect transmission effectiveness between nodes through defining and representing parameters of the communication capacity between the nodes through considering the transmission failure probability generated by channel fading and neighbor node channel usage condition; and on this basis, a new routing metric suitable for city scenes is given to realize the protocol design of a network layer and an MAC layer so as to more effectively utilize the nodes for forwarding. The cross-layer vehicle network routing method based on the link transmission capacity takes the improvement of the link stability as an objective and reduces the number of times of repeatedly establishing a route as far as possible so as to reduce the average end-to-end time delay and reduce the packet loss probability.