Self-adaption data distributing method based on node density distribution in vehicle-mounted ad hoc network

Abstract

The invention relates to a self-adaption data distributing method based on node density distribution in a vehicle-mounted ad hoc network. The method comprises the following steps: when nodes in the vehicle-mounted ad hoc network come across and a message is needed to be sent, judging the nodes are located in a hotspot area or non-hotspot area according to present positions of the nodes; if being in the hotspot area, selecting a node with a maximum node degree from present adjacent nodes to forward the message; if being in the non-hotspot area, adopting an infective routing protocol data distributing system to generate a message copy and directly forwarding the message; using a distribution type density sensing algorithm to quickly acquire space distribution information of the network nodes and hotspot area; using a hop limit function based on graph theory and complex network theory to estimate an average distance for forwarding the message to the hotspot area; and performing dynamic hop limit on the message by using priori knowledge of node space distribution, thereby realizing dynamic adjustment of a message forwarding mode, acquiring high performance close to the infective routing and obviously reducing quantity of redundancy message copy.

Description

Technical field [0001] The invention belongs to the technical field of ad hoc networks, and in particular is an adaptive data distribution method based on node density distribution for vehicle ad hoc networks. Background technique [0002] Vehicle Ad-hoc Networks (Vehicular Ad-hoc Networks, referred to as VANET) is a self-organizing heterogeneous wireless multi-hop network composed of wireless nodes (referred to as nodes in this article) installed on vehicles and Road Side Unit (RSU for short) , The communication mode includes self-organizing multi-hop communication between nodes and communication between nodes and RSU. The vehicle-mounted ad hoc network is a special application of wireless sensor network and wireless ad hoc network in the field of intelligent transportation. It has obvious new features: large network scale, fast node movement speed, uneven spatial distribution of nodes, node movement trajectories are restricted by roads, nodes have strong computing power and su...

AI Technical Summary

Problems solved by technology

[0017] Although the distribution and waiting routing protocol can significantly reduce resource consumption, due to the limitation of the number of "relay" nodes, the performance indicators of this protocol, such as transmission success rate and average delay, are significantly lower than those of infectious routing.

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