Federated learning (FL), as an innovative paradigm of distributed learning, provides reliable support for the growing edge intelligence (EI). The limitations of traditional FL’s reliance on ground base stations (BSs) make the development of aerial server unmanned aerial vehicles (UAVs) inevitable, thereby developing the air-ground integrated FL (AGIFL). However, current efforts predominately focus on static offline training based on existing datasets and some efforts consider online training in dynamic sample environments, where new samples need to be fully pre-trained to determine sample quality. To this end, we study how to realize high-performance of FL in dynamic environment without training all samples. Specifically, we formulate a joint optimization problem for sample selection, UAV deployment, and resource distribution aiming to minimize the trade-off between the user energy consumption and FL performance. To address the optimization problem without explicit expression, we employ meta-learning to derive an upper bound on the gradient norm of the loss function to evaluate learning performance, and describe how time-varying small-batch ratios affect this bound. Then, we propose an optimization algorithm that ensures convergence, capitalizing on the block coordinate descent techniques. To demonstrate the efficacy of our algorithm, we conduct both extensive simulations and proof-of-concept field experiments. The findings indicate an average improvement of approximately 39% in reducing the objective value when compared to the benchmarks.

IEEE INFOCOM 2023 - IEEE Conference on Computer Communications, New York City, NY, USA, 17-20 May 2023

With the envision of sixth generation (6G) network technology, varied artificial intelligence (AI) services gradually develop from the network center to the edge, which makes unmanned aerial vehicle (UAV) a hot spot to provide auxiliary services of machine learning (ML) to empower terrestrial users intelligence. However, due to the sensitive privacy and limited resources, traditional centralized ML may not be used directly in such networks. As a promising distributed collaborative ML, fed-erated learning (FL) could be more suitable. Meanwhile, unlike conventional FL working on terrestrial networks, applying FL in UAV-assisted networks should strictly consider the impact of air-ground wireless channel caused by the maneuverability of UAVs, as well as the allocation of various network resources, including frequency and latency. To address these challenges, we propose to jointly optimize the UAV location and resource allocation, subject to the constraints of learning accuracy and training latency to minimize the energy consumption of terrestrial users. The for-mulated complicated non-convex problem is efficiently solved by an alternating optimization algorithm based on successive convex approximation (SCA) approaches after problem decomposition. Simulations results show that our proposed algorithm can reduce more overall users' energy consumption than three benchmarks while guaranteeing the learning accuracy within the maximum training latency.