Node transmission capability based vehicular spray and focus routing protocol method

Abstract

The invention provides a node transmission capability based spray and focus routing protocol method. The method comprises a multi-copy spray stage and a single-copy focus stage. The multi-copy spray stage indicates that possible routes are searched by spraying the message copies to a network when a node owns multiple copies of a certain message. According to the method, the transmission capabilities of nodes for the messages are measured through factors such as the vehicle speed, change rates of encountering nodes and residual cache sizes, and message spray tasks are allocated proportionally according to the transmission capabilities. The single-copy focus stage indicates that the node is allowed to forward the unique message copy to a relay node with the transmission capability higher than that of the node when the node owns the copy of a certain message. The forwarding of the message is controlled by taking the node transmission capability as a comparison condition. According to a cache management strategy designed by the method, the redundant messages are eliminated through adoption of a delivery message confirmation mechanism; and the sending sequence of the messages is determined by taking the residual survival time of the messages and the number of the copies capable of being copied as message allocation priorities.

Description

technical field [0001] The invention relates to the field of vehicle ad hoc routing protocol vehicle ad hoc network and opportunistic network technology, and in particular to a vehicle distribution focus routing protocol method based on node transmission capability. Background technique [0002] Vehicular Ad-hoc Network (VANET) is one of the most promising fields of mobile ad-hoc network at present, and its technical development is of great significance to the construction of intelligent transportation system. As the key technology of network interconnection and data exchange, the routing protocol determines the performance of the entire vehicle ad hoc network to a certain extent. Due to the characteristics of fast node movement, frequent topology changes, and unguaranteed end-to-end paths in vehicular ad hoc networks, it is difficult for traditional ad hoc network routing protocols to play a role in vehicular scenarios. The opportunistic network is a self-organizing networ...

AI Technical Summary

Problems solved by technology

When the storage space of the node is limited, the effective utilization of the cache may be reduced, and the opportunity to receive messages will be lost when the cache space is insufficient.

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