Cooperative Lossy Communications in Unmanned Aerial Vehicle Networks: Age-of-Information With Outage Probability
Cooperative Lossy Communications in Unmanned Aerial Vehicle Networks: Age-of-Information With Outage Probability
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DOI：
10.1109/tvt.2021.3103103
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发表时间：
2021-08
影响因子：
6.8
通讯作者：
Wensheng Lin;Lixin Li;Jinhong Yuan;Zhu Han;M. Juntti;T. Matsumoto
中科院分区：
文献类型：
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作者：
Wensheng Lin;Lixin Li;Jinhong Yuan;Zhu Han;M. Juntti;T. Matsumoto
本文分析了无人机 (UAV) 网络中协作有损通信的鲁棒性和及时性。该分析框架由两个步骤组成：1) 计算中断概率，2) 表征给定中断概率的信息时代 (AoI)。最初，我们根据香农有损源信道分离定理确定中断概率。数值结果表明，联合解码降低了中断概率，并且系统可以在不太严格的失真要求下实现更高的分集阶数。然后，我们推导出通信系统平均 AoI 下界的封闭式表达式，其中中断事件被限制在可接受的水平。此外，我们进行了一系列模拟来验证平均 AoI 的下限并评估无人机位置对平均 AoI 的影响。结果表明，当服务器利用率相对繁忙或空闲时，下限是严格的。对于中断概率相对较大的情况，我们提出了一种间歇传输方案来改善 AoI 性能，而无需额外的能耗。仿真和下限分析都验证了间歇传输方案降低平均 AoI 的有效性。
This article analyzes the robustness and timeliness for cooperative lossy communications in unmanned aerial vehicle (UAV) networks. The analytical framework consists of two steps: 1) calculating the outage probability, and 2) characterizing the Age-of-Information (AoI) for a given outage probability. Initially, we determine the outage probability based on the Shannon's lossy source-channel separation theorem. Numerical results indicate that joint decoding reduces the outage probability, and the system can achieve higher diversity order for less stringent distortion requirement. Then, we derive a closed-form expression of the lower bound on the average AoI for the communication system where outage events are constrained to an acceptable level. Moreover, we conduct a series of simulations for verifying the lower bound on the average AoI and evaluating the impact of UAV locations on the average AoI. It is demonstrated that the lower bound is tight when the server utilization ratio is either relatively busy or idle. For the case with a relatively large outage probability, we propose an intermittent transmission scheme to refine the AoI performance without extra energy consumption. The effectiveness of the intermittent transmission scheme for reducing the average AoI is verified by both the simulations and the lower bound analysis.