Risk-Aware and Energy-Efficient AoI Optimization for Multi-Connectivity WNCS with Short Packet Transmissions
CoRR(2023)
摘要
Age of Information (AoI) has been proposed to quantify the freshness of
information for emerging real-time applications such as remote monitoring and
control in wireless networked control systems (WNCSs). Minimization of the
average AoI and its outage probability can ensure timely and stable
transmission. Energy efficiency (EE) also plays an important role in WNCSs, as
many devices are featured by low cost and limited battery. Multi-connectivity
over multiple links enables a decrease in AoI, at the cost of energy. We tackle
the unresolved problem of selecting the optimal number of connections that is
both AoI-optimal and energy-efficient, while avoiding risky states. To address
this issue, the average AoI and peak AoI (PAoI), as well as PAoI violation
probability are formulated as functions of the number of connections. Then the
EE-PAoI ratio is introduced to allow a tradeoff between AoI and energy, which
is maximized by the proposed risk-aware, AoI-optimal and energy-efficient
connectivity scheme. To obtain this, we analyze the property of the formulated
EE-PAoI ratio and prove the monotonicity of PAoI violation probability.
Interestingly, we reveal that the multi-connectivity scheme is not always
preferable, and the signal-to-noise ratio (SNR) threshold that determines the
selection of the multi-connectivity scheme is derived as a function of the
coding rate. Also, the optimal number of connections is obtained and shown to
be a decreasing function of the transmit power. Simulation results demonstrate
that the proposed scheme enables more than 15 folds of EE-PAoI gain at the low
SNR than the single-connectivity scheme.
更多查看译文
关键词
AoI,risk-aware,energy efficient,multiconnectivity
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要