Novel secure user scheduling for uplink wireless networks against potential eavesdroppers

초록

In this paper, we address security threats in an uplink wireless communication network comprising a single base station (BS), multiple legitimate user equipment (UEs), and potential eavesdroppers (EVEs). In this scenario, the EVEs may unintentionally intercept the uplink transmissions of legitimate UEs, posing significant risks to confidentiality. To overcome these threats, we propose novel analytical two-step opportunistic feedback (TOF) strategies to enhance physical-layer security (PLS) under the assumption that each legitimate UE has local channel state information (CSI). The TOF strategy consists of two stages: in the first stage, legitimate UEs perform conservative feedback for user scheduling, assuming all potential EVEs are eavesdropping. If no UE meets the feedback condition, the conventional opportunistic feedback (OF) mechanism is applied in the second stage, where legitimate UEs with channel gains above a predefined threshold send feedback to the BS. We mathematically analyze the secrecy outage probability (SOP) and effective secrecy throughput (EST) of the proposed TOF strategies. Simulation results demonstrate that the TOF strategies significantly outperform the conventional OF approach, achieving lower SOP and higher EST across various scenarios.

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