46 results about "Aodv routing protocol" patented technology

The invention provides an inter-group routing method for a distributed satellite network. The inter-group routing method comprises the following steps: in the case that data in source satellite groups within the distributed satellite network needs to be sent, sending a routing request to main satellites of the respective satellite groups within the distributed satellite network; collecting the information of the satellite and pheromone values in an AODV (Ad Hoc on-demand distance vector) routing protocol once the routing request arrives at the main satellite of each satellite group; calculating the probability of sending the routing request to each satellite according to a next-hop selection algorithm, and selecting the next-hop satellite for sending the routing request from each satellite according to the calculated probability of each satellite; updating partial pheromones according to the time delay and available bandwidth of a link once a satellite is passed, and selecting the next-hop satellite for sending the routing request according to the partial pheromones; and generating a routing reply after the target satellite receives the routing request, thus establishing reverse routing between the source satellite and the target satellite. According to the inter-group routing method provided by the invention, a communication time delay is shortened, the available bandwidth of the link is increased, and the communication quality of the link is improved.

The invention relate to an Ad Hoc network construction method based on an OMAP 3530Mini development board which realizes the Ad Hoc network by using the OMAP 3530Mini development board as a hardware platform and using a wireless local area network card as hardware support. The method comprises the following steps of: manufacturing an embedded kernel suitable for the OMAP 3530Mini development board in the development environment of Ubuntu, adding necessary function in the kernel to adapt the requirement of the Ad Hoc network, manufacturing a simple root file system to finish the basic function of the file system, compiling the driver of the wireless local area network card in an intersecting way so that the driver can be successfully operated on the development board, driving the wireless local area network card to operate, compiling a wireless configuration tool in an intersecting way to perform network configuration on the wireless local area network card, transplanting an AODV (Ad Hoc On-demand Distance Vector) routing protocol so that a node in the network can perform multi-hop communication so as to finally construct the Ad Hoc network, performing point-to-point communication test and multi-hop test on the constructed network, and performing tests of functions for word communication, voice communication, ftp file transmission and the like.

The invention relates to an energy-saving routing method for wireless sensor network based on power control. The invention relates to establishment of optimum communication power between node and neighbor, establishment of energy-optimizing route. The invention provides a power control method for minimizing communication power between nodes, based on that and designs an energy-saving routing protocol considering multipath total consumption and selecting path of minimum power consumption for data transmission based on AODV routing protocol; the routing protocol can save energy in energy-limited wireless sensor network.

The invention relates to a wireless sensor network AODV routing protocol implementation system and method. When a sending source node does not detect the routing information of a node which reaches a destination, a routing request carrying the routing forwarding cost factor weight is broadcasted to surrounding nodes. An intermediate node receives the routing request, calculates the power level factor and the load state factor of the node, and determines whether the node is suitable for the transmission of the routing request. If the node is suitable for the transmission of the routing request, the intermediate node updates the routing forwarding cost factor weight carried by the routing request according to the power level factor, the load state factor and the hop weight of the node, and forwards the updated routing request. Based on the power level factor of the node, the load state factor of the node and the hop weight, the node energy and the load condition are taken into account in the process of routing selection to avoid routing in the node with congestion and insufficient residual energy. The system and method meet the application requirements of a wireless sensor network. The data transmission performance of the wireless sensor network is improved.

A mixed topologic control method improving route protocol performance and system integral performance combines with AODV protocol. The technical solution is that method comprises an area division, a topologic control in an area and a topologic control among areas, characterized in that further comprises steps of improving AODV route protocol; adding two control messages POSITION and POWER in the AODV route protocol, respectively to send the topologic information to a central node by a node in the area and to send the power configuration information to each corresponding node by the central node, adding corresponding message sending and receiving function as well as a timer to carry out the topologic control; on another hand, mending a Hello message format and process flow of AODV and solving single way channel problem that could occur after topologic control and carrying out distributing control.

The present invention relates to a timeslot multiplexing wireless chain multi-hop cross-layer optimization method, which is applicable to wireless long-distance chain multi-hop communication. A chain multi-hop timeslot allocation algorithm is designed by combining a TDMA channel access mechanism with an AODV routing protocol, and a transmit-receive timeslot is allocated to each node, to ensure that a same timeslot is allocated to any two nodes outside a two-hop neighbor node range, and implement cross-layer optimization. Because neighbor nodes in a two-hop range easily conflict, three timeslots need to be allocated for data transmission. A transmit-receive timeslot of a node is allocated by using a routing control message of a network layer without adding overhead of another control message. According to the optimization method, a channel waste problem caused by conventional TDMA is resolved in a timeslot deployment manner by using a cross-layer design method and comprehensively considering a TDMA network feature.

The invention belongs to the technical field of wireless Ad hoc communication local area network clock synchronization and discloses an ultraviolet light communication network clock synchronization system and method. According to the clock synchronization system, a host-slave mode Ad hoc network topology structure is employed. According to the clock synchronization method, a local clock source of a host is taken as a reference clock; a network NTP clock synchronization protocol, an AODV routing protocol and a quantitative prediction method are optimized and fused; a host carries out time information interaction with a first level intermediate slave, a second level intermediate slave, an Nth level intermediate slave and a destination slave according to a path discovery process; and the clocks of the slaves and the reference clock of the host are synchronized, so the clock of each communication slave on an ultraviolet light communication multi-hop network and the clock of the host are synchronized. According to the system and the method, the energy consumption of the host and the slaves is balanced, the information transmission times in the network is reduced, network loads and an information transmission conflict probability are reduced, the clock synchronization precision of the whole network is ensured, and the system and the method are particularly applicable to communication of military squads.

The invention relates to a method for designing a wireless terminal which can realize data wireless transceiving and has a routing function. The method comprises the following steps of: establishing a mobile ad hoc network hardware terminal on a random access memory (ARM) Linux platform; connecting a wireless network card supporting 802.11a/b/g by using a Samsung processor s3c2410; and arranging modules such as a synchronous dynamic random access memory (SDRAM), a Nand, a flash, a debugging serial port and a power supply to obtain a hardware framework of the wireless terminal. On the basis, Bootloader, a Linux kernel, a file system and an ad hoc on-demand distance vector (AODV) routing protocol are transplanted. In order to more easily demonstrate the function of a routing protocol, iptables is also transplanted. Based on the 802.11a/b/g, the whole wireless terminal equipment having the routing function realizes the demonstration of route jump and a self-organization function, and a hardware circuit board is packaged to form the wireless terminal equipment having the routing function.

The invention discloses method, node and system of network access. The method comprises the following steps: a terminal generates a first domain number abstract according to the information includinga terminal domain number, carries the first domain number abstract in the route request message, and sends the route request message; a relay node receives the route request message, extracts the first domain number abstract, and generates a second domain number abstract according to the information including the relay node domain number; and when the first domain number abstract and the second domain number abstract are consistent, the relay node executes the forwarding of the route request message. By adding the domain information in the route request message and adding the judgment of the domain information in the route process, the invention prevents a non-signed user from using the network resource, and enables the node which relates to an AODV route protocol to become the node whichcan be managed and controlled by operators.

The invention discloses an unmanned aerial vehicle ad hoc network AODV routing improvement method based on speed and energy awareness. According to the method, a cross-layer idea is combined, a link cost concept is provided, an energy residual rate, a relative movement degree and a congestion degree are used as measurement indexes to define link cost, a routing criterion is modified, and a path is selected according to the minimum link cost. Thus, the improved AODV routing protocol with speed energy awareness is designed; in addition, a relay broadcast strategy based on the number of neighbor nodes is proposed, and a probability factor and a random factor are introduced to realize a relay probability hierarchical broadcast function to reduce RREQ broadcast redundancy. Compared with the traditional AODV routing protocol, the protocol improved by the method shortens the end-to-end delay between the nodes, improves the packet delivery rate and reduces the routing discovery frequency. In addition, according to the method, the energy consumption is reduced, the average residual energy of the nodes is increased, the routing overhead is effectively controlled, the overall performance of the network is improved, and the method is more suitable for the topological environment of the unmanned aerial vehicle ad hoc network.

The invention provides an energy efficiency AODV routing protocol implementation method applicable to a wireless sensor network. The method comprises the following steps that 1, the network is initialized and set; 2, a source node initiates a route finding process; 3, the source node selects an optimal route; 4, after route finding is finished, in the route working process, a route error and route maintenance mechanism based on energy is increased. The energy efficiency AODV routing protocol implementation method applicable to the wireless sensor network not only can reduce energy consumption of the whole wireless sensor network, but also can delay the splitting time of the network, thereby prolonging the service life of the network and reducing resource waste caused by repeated network deployment.

The invention discloses a Multi-node ad hoc network transmission simulation method and simulation system based on AODV protocol, and relates to the simulation method and the simulation system for the multi-node ad hoc network transmission. The invention aims to solve the problems that the communication condition during multi-node communication cannot be simulated when a real node is limited by physical conditions, and a network scene simulated by simulation software is greatly different from a real physical world. The method comprises the following steps of: 1, establishing a simulation scene by using four real physical nodes; 2, running a communication program for instruction transmission on the relay node and the server node; 3, shielding a path between the source node and the destination node, so that the source node and the destination node cannot discover each other during networking; 4, running an AODV routing protocol capable of simulating hop count increase during multi-node communication on the source node, the relay node and the destination node; and 5, running a communication program for data transmission on the source node, the relay node and the destination node. The invention is applied to the simulation field of multi-node ad hoc network transmission.

The invention discloses a network route selection method and system based on inter-node distance stability, and relates to the technical field of network route selection. According to the invention, GPS positioning information of routing equipment is mainly used to calculate the distance between the two nodes; the distance between two nodes is sampled for multiple times, a single-hop stable valuecalculation model between the nodes is constructed, a stable value between an intermediate node and a neighbor node of the intermediate node is calculated, the AODV routing protocol flow is redesigned, a route with the highest stability is selected, and effective transmission of data is realized. By applying the method and the system, the problems that the relative stability of the nodes is not considered in the path selection process of the traditional AODV routing protocol and link breakage is easy to occur are solved, and the waste of network resources is reduced.