Cross-layer Opportunistic Routing Method for Internet of Vehicles Based on Distributed Congestion Control Strategy

Abstract

The invention discloses a cross-layer opportunistic routing method for Internet of Vehicles based on a distributed congestion control strategy. The channel load CL of the control layer and the state average value AS of all its neighbor nodes; the vehicle node adaptively adjusts the current state machine based on the relationship between the statistical value of CL and the preset threshold, and the relationship between s and AS, so as to control the transmission of cooperative perception information CAM and routing messages Power, transmission data rate and receiving sensitivity, adaptively adjust the communication range of CAM and routing messages; vehicle nodes use CAM to update neighbor node status information in real time, and select greedy forwarding for routing messages according to the positional relationship between itself, neighbor nodes and destination nodes Or chance to retweet. The invention can effectively alleviate channel congestion, realize fair and reliable transmission of vehicle network security information under different traffic density conditions, and improve the delivery rate of routing messages.

Description

technical field [0001] The invention belongs to the technical field of Internet of Vehicles communication, and mainly relates to a cross-layer opportunistic routing method for Internet of Vehicles based on a distributed congestion control strategy, which can be used for fair and reliable transmission of Internet of Vehicles security information and congestion control of Internet of Vehicles routing protocols. Background technique [0002] The Internet of Vehicles has become an important part of intelligent transportation and intelligent driving because it can perceive the surrounding traffic environment in real time and realize real-time information interaction between the vehicle and surrounding vehicles, road facilities and pedestrians. However, due to factors such as high-speed movement of vehicle nodes and rapid changes in network topology, it is difficult for vehicular ad hoc networks to maintain a stable communication link. With the continuous maturity of vehicular ad ...

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Problems solved by technology

However, many studies have ignored the limitations of the underlying protocol, especially in urban scenarios with high traffic density. The current vehicle node broadcast cycle safety information basically spreads the information as much as possible. Due to traffic congestion and network congestion, Periodic broadcasting of security information is likely to cause long-term random backoff waiting and packet discarding of security information, which is very unfavorable to the status information update of relay vehicle nodes and destination vehicle nodes in the process of opportunistic routing, and the real-time performance is poor, which easily leads to routing failures. Misjudgment in decision making

[0003] As the first standard designed specifically for communication on the road, the main disadvantage of IEEE 802.11p MAC is poor performance when the channel load is severe, with problems such as low reliability, hidden nodes, infinite delay and intermittent V2I connectivity

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