GPSR-RA: GIAO THỨC ĐỊNH TUYẾN DỰA TRÊN VỊ TRÍ KẾT HỢP ĐIỀU CHỈNH TỐC ĐỘ BÍT KÊNH TRUYỀN CHO FANET SỬ DỤNG MÔ HÌNH THIẾT KẾ XUYÊN TẦNG

Abstract

This paper proposes the GPSR-RA (GPSR with BitRate Adaptation) protocol, which adopts a cross-layer design approach by combining position-based routing with dynamic bitrate adjustment. GPSR-RA retains the routing mechanism of GPSR but incorporates a dynamic bitrate adjustment mechanism based on the Signal-to-Noise-plus-Interference Ratio (SNIR). GPSR-RA collects SNIR information from the physical layer via Hello packets, pass this information to the MAC layer immediately after determining the next-hop node. The bitrate adjustment module (MACSnir-RA) in GPSR-RA actively increases or decreases the bitrate according to the SNIR value, enabling the system to respond promptly to channel condition changes, thereby improving network performance. Simulation results on the OMNeT++ platform demonstrate that GPSR-RA significantly enhances packet delivery ratio, increases throughput, and reduces delay compared to GPSR.