The invention discloses a link duration calculation method, an MPR node selection method and a routing protocol, wherein, the MPR node selection method comprises the following steps: S1, adding a member of N1 set whose forwarding intention is WILL_ALWAYS into the MPR set; S2, calculating the coverage rate of all nodes in N1; S3, calculating the link duration from the local node to the node in N1;4, if a node exists in N2 can only be reached through a unique node in N1, adding the node in N1 into the MPR set; 5, judging whether there is a node not covered by the MPR node in the N2, if not, thealgorithm ends, otherwise, calculating the coverage rate of the MPR node not selected in the N1; the nodes with the highest coverage and the longest link duration are selected to join the MPR set, and the nodes covered by the MPR set are removed. S6: Loop until N2 is empty. As a result of that invention, the LD-OLSR routing protocol has about 10% average end-to-end delay, normalized throughput, number of TC packets, and routing overhead. 15% performance improvement.

A method for calculating link duration, MPR node selection method and routing protocol

The invention discloses a satellite self-organizing network route survivability method based on link survival time, which comprises the following steps: generating a neighbor table according to Hellopacket messages of satellite nodes and neighbor nodes thereof, and then predicting the link survival time between each satellite node and the neighbor node thereof in a satellite self-organizing network; selecting an MPR node of each satellite node, and establishing a satellite self-organizing network topological graph through an MPR node whole network broadcast TC message of the satellite nodes;calculating a main route and an alternative route from a source node to a destination node in the satellite self-organizing network topological graph/temporary network topological graph A by adoptinga Dijkstra algorithm based on hop count and link survival time; wherein the temporary network topological graph A is obtained by deleting all satellite nodes of non-source nodes and destination nodesin the main route from the satellite self-organizing network topology The routing destroy-resistant method of the scheme solves the problem that a traditional OLSR routing protocol is prone to link failure in application of a satellite self-organizing network

Satellite self-organizing network route survivability method based on link lifetime

Quality assurance mechanism based on wireless TCP cross-layer service in mobile Ad Hoc network: Quality assurance mechanism based on wireless TCP cross-layer service in mobile Ad Hoc network

The invention discloses an MPR backup method based on link lifetime. The MPR backup method comprises the steps that a satellite node periodically broadcasts a Hello packet message outwards and receives the Hello packet message periodically broadcasted outwards from a neighbor node; a neighbor table is generated according to the Hello grouping messages of the satellite nodes and the neighbor nodesthereof, and then the link survival time between each satellite node and the neighbor node thereof in the satellite self-organizing network is predicted; and MPR nodes and alternative MPR nodes of thesatellite nodes are selected, and the MPR nodes and the alternative MPR nodes are added into the MPR set. According to the scheme, the alternative MPR nodes of the satellite nodes are introduced; when an MPR node failure problem occurs, the backup node is directly selected to forward the TC control message without waiting for the Hello message to interact again, form the neighbor table again, select the MPR node again and repair the MPR node quickly, so that the resource utilization rate and the operation efficiency are improved, and the correct formation of the whole network topology is ensured.

MPR backup method based on link lifetime

The present invention provides a routing method and apparatus for a mobile ad hoc network, applied to a target network node in a mobile ad hoc network. First, node information of neighbor nodes of a target network node within a preset range is obtained, wherein said information comprises device forms; then, multipoint relay (MPR) nodes matching the target network node are determined according to the device forms of the neighbor nodes within the preset range; and finally, network topology information obtained by the target network node according to the node information of the neighbor nodes within the preset range is flooded in the mobile ad hoc network by means of the MPR nodes matching the target network node, for each network node in the mobile ad hoc network to determine corresponding routing information. According to the present invention, MPR nodes are determined based on device forms to flood topology information, thereby overcoming the disadvantage of being unable to obtain a better MPR node set by simply selecting MPR nodes from network node coverage, and improving the network efficiency and comprehensive network performance of the mobile ad hoc network on the whole.

Routing method and apparatus for mobile ad hoc network

The invention discloses a hierarchical routing method based on service quality in a wireless multi-hop network. According to signal to interference plus noise ratio (SINR) of an environment which a node in a network is disposed in and a node moving direction, a link duration (LD) between the node and a hop of neighbor node is predicted, and a selection policy of a relay node multipoint relay (MPR) in an optimized link sate routing (OLSR) protocol is improved and optimized; and the stability of a network topology is well maintained, the network load and the overhead are reduced effectively, the data loss rate is reduced, the network service quality is improved, and the method is also applied to message delivery between nodes in a wireless sensor network.

Hierarchical routing method based on service quality in wireless multi-hop network

The utility model discloses an online ammonia nitrogen content testing device based on thing networking, including setting up sensor node, master control treater, amplifier circuit, signal conditioning circuit, signal range regulating electrical resistance network and the ammonia nitrogen analysis circuit in the shell, this master control treater is including data collection storage module, data processing module and ADC module, this data collection storage module connects sensor node, and this data processing module connects data collection storage module, and data processing module is connected to this ADC module, and this amplifier circuit connects the ADC module, and this signal conditioning circuit connects amplifier circuit, this storage module 0 storage module 1 internet access signal conditioning circuit, and the storage module 0 storage module 1 network is connected to this ammonia storage module 3 circuit. The utility model discloses continuously ammonia nitrogen content in on -line monitoring water treatment and the transportation is applicable to the occasion that the check point is in large quantity and disperse, has practiced thrift the cost.

Online ammonia nitrogen content testing device based on thing networking

Handoff will be occurred if the stations STAs move out of the area covered by access points APs in wireless local area network WLAN during voice over WLAN VoWLAN session. The handoff latency in conventional WLAN exceeds to one hundred milliseconds, which is unacceptable for voice over internet protocol VoIP. This paper proposes a mechanism named fast handoff with differentiated services FHDS, which can provide prioritised contention-free access through broadcasting scheduling. The impact of Non Real time Service upon VoIP is considered. VoIP packets and NRS packets are randomly generated by STAs. Various probabilities of generating VoIP packets are considered in order to analyse the performance of FHDS. Simulation results show that compared to existing solutions, FHDS can effectively improve the performance of VoWLAN in terms of handoff latency and resource utilisation. And the higher the probability is, the better improvement can be achieved by FHDS.

Fast handoff with differentiated services based on broadcasting scheduling for VoWLAN

The invention provides a redundant routing method based on service quality and directional broadcast in a wireless multi-hop network. Prior to data transmission, the network load is reduced by reducing the broadcast messages in the network through the directional broadcast, meanwhile a main routing and a backup redundant routing are determined between a source node and a destination node according to the minimum signal to interference noise ratio SINR required by the system, after the interruption of the main routing, the node in the network does not need to calculate the routing again, and the data can be submitted to the destination node by the redundant routing.

Redundant routing method based on service quality and directional broadcast in wireless multi-hop network

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Hierarchical routing method based on service quality in wireless multi-hop network

Online ammonia nitrogen content testing device based on thing networking

Fast handoff with differentiated services based on broadcasting scheduling for VoWLAN

Redundant routing method based on service quality and directional broadcast in wireless multi-hop network