Abstract: The geographical location routing protocol has been widely used in FANET networks due to its low overhead and good scalability.However,its strategy of relying on the nearest neighbor node as the relay in greedy forwarding process still has certain limitations.This paper proposes a cross layer link quality state aware unmanned aerial vehicle geographic location routing protocol(CLAQ-GPSR) suitable for frequently changing topology and congested network environments by sensing channel link quality.By establishing a communication security zone,establishing a measurement model for link load and inter flow interference,using delivery ratio ETX to measure link quality,and combining data from the physical layer,MAC layer,and network layer to comprehensively measure the most reliable relay nodes,communication quality can be improved.At the same time,the combination of left and right hand forwarding rules is used to accelerate the forwarding speed in path recovery and avoid routing loops and other issues that occur in traditional peripheral forwarding.Through comparative analysis on network simulation platforms,it is found that,compared with the traditional GPSR,W-GeoR,and DGF-ETX protocols,the proposed protocol has advantages in terms of packet delivery success rate,end-to-end latency,and average hop count.

Key words: GPSR, FANET, Link quality, Interflow interference, Channel idle rate, Left and right hand combination forwarding