In-vehicle network GPSR protocol greedy forwarding method

Abstract

The invention discloses an in-vehicle network GPSR protocol improved greedy forwarding method. An improved protocol carries out management on neighbor table information, and additionally defines accumulated communication time, that is, accumulated communication time between neighbour nodes; a hello packet comprising vehicle position information and the accumulated communication time and the like is sent between the nodes at a regular time, meanwhile, after the hello packet is received, a neighbor list is updated and a neighbor node list can be updated in real time; when a source node sends a data packet to a destination node, the source node finds a node, which is nearest to the destination node, in neighbour nodes thereof, calculates the distance between the node and the destination node and calculates an allowable distance range according to the shortest distance; and prediction of communication stability between vehicles is realized by comparing the accumulated communication time of the vehicles within the given distance range to find a most stable next-hop node. The improved protocol takes both distance factor and communication stability between the nodes into considerations when carrying out greedy forwarding, so that GPSR in-vehicle network application is allowed to reach a better effect.

Description

technical field [0001] The invention relates to a greedy forwarding method in the GPSR routing protocol of a vehicle network, and belongs to the technical field of vehicle communication networks. Background technique [0002] With the increase of global car ownership, the aggravation of road congestion and the frequent occurrence of traffic accidents, there are more and more technologies and measures to improve road safety. Among them, the rapid development of network technology makes the workshop network emerge as the times require. The workshop network is to join the vehicles on the road into the network, through the mutual communication between vehicles, so as to perceive the existence and operation status of the surrounding vehicles, and accordingly prevent potential dangers. In the workshop network, vehicles are the nodes of the workshop network. Because the vehicle has the characteristics of fast movement, the workshop network is a network with frequent topology change...

AI Technical Summary

Problems solved by technology

However, in the workshop network, there are still problems in the GPSR routing protocol. When the protocol performs greedy forwarding, it always selects the node in the neighbor list that is geographically closest to the destination node as the next hop. At the edge of the communication range, and because the movement speed of the nodes changes rapidly, the next-hop node selected by the greedy forwarding mechanism is likely to move out of the communication range before the data packet arrives, causing the retransmission or loss of the data packet, and making the overall network reduced performance

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