Optimal relay selection method based on power control technology in Internet of Vehicles

Abstract

The invention discloses an optimal relay selection method based on transmission power control technology in the Internet of Vehicles, which includes the following steps: (1) The mobile vehicle calculates the relative distance to the neighbor node by obtaining the current GPS position vector information of all neighbor vehicles ;(2) Based on the physical channel attenuation model, calculate the transmission power required for reliable transmission to each neighbor node; (3) According to the 802.11p protocol, calculate the MAC layer transmission delay caused by each transmission power; (4) The reliability and delay of data transmission are combined to calculate the priority of each neighbor selected as a relay, and the neighbor with the highest priority is selected as the relay for the optimal current information transmission. This method takes advantage of the characteristics of a wide range of adjustable transmission power of vehicle communication equipment, and comprehensively considers various factors such as physical channel attenuation, MAC layer message collision, and retransmission delay to select the optimal relay, and realizes that messages in the Internet of Vehicles are transmitted in real time. Reliable and large-scale transmission, the application prospect is very broad.

Description

technical field [0001] The invention belongs to the technical field of wireless transmission and data distribution in the Internet of Vehicles, and in particular relates to an optimal relay selection method based on transmission power control technology. When the source node selects the relay from adjacent vehicles, two factors, wireless signal attenuation and MAC layer transmission delay, are taken into account, and the purpose of reliable and efficient information distribution in the Internet of Vehicles is realized. Background technique [0002] In the Vehicular Ad-hoc Network (VANET), high-speed moving vehicles share traffic road information in real time through a wireless ad-hoc network to improve traffic safety. The information transmitted between vehicles is usually divided into two types: periodic Beacons and accident-triggered Warning messages. Among them, the Beacons message mainly includes the current vehicle's speed, acceleration, GPS position vector and other i...

AI Technical Summary

Problems solved by technology

A current common solution is to modify the routing protocol in the traditional mobile ad hoc network and transplant it to the Internet of Vehicles, but the high-speed movement of nodes in the Internet of Vehicles, the rapid changes in network connectivity and topology, and the vehicle trajectory are limited. The fixed structure of roads and other characteristics make this kind of scheme low reliability and large end-to-end delay in the data distribution process; another kind of thinking is shown in the literature [H.Lu, etc, "Balancing broadcast reliability and transmission range in VANETs", IEEE Vehicular Networking Conference, pp247-254, USA, December 2010], according to the vehicle density real-time adjustment of the wireless transmission power to improve the network connectivity of mobile vehicles, by increasing the transmission power can improve the signal strength, increase the information is more distant neighbor nodes Probability of successful reception

However, the larger communication radius also increases the probability of MAC layer data transmission collisions and multiple retransmissions, which intensifies the single-hop MAC transmission delay.

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