6G Air-to-Ground Connectivity: A Codebook-Based Framework for Interference Management

초록

Air-to-Ground (A2G) integration offers a more promising solution than satellite links, due to lower latency and higher throughput. However, this integration faces significant challenges, particularly co-channel interference, which necessitates the development of advanced interference mitigation strategies. This paper investigates the coexistence of aerial uplink (UL) and ground downlink (DL) communications in dynamic Time-Division Duplexing (D-TDD) systems, where UL transmissions from aerial users introduce severe interference to the DL transmissions of TN users. To address the issue of user-to-user interference (UL-DL) in A2G system, this work proposes a novel Codebook-Based Interference Mitigation (CBIM) framework that incorporates a sliding codebook approach for radio frame configuration (RFC) selection and a dynamic subframe swapping mechanism to resolve subframe misalignments and reduce interference. By optimizing subframe arrangements, the framework effectively minimizes interference while improving resource utilization. Simulation results demonstrate the framework’s effectiveness, achieving a 20.37% reduction in interference and a 28.21% increase in throughput, establishing CBIM as a robust and efficient solution for the future TN-NTN integration in next-generation communication systems. © 1983-2012 IEEE.

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