论文标题
与随机性到达的合作状态更新系统中面向年龄的机会性接力
Age-Oriented Opportunistic Relaying in Cooperative Status Update Systems with Stochastic Arrivals
论文作者
论文摘要
本文考虑了一个合作状态更新系统，其旨在在继电器的帮助下尽快将随机生成的状态更新发送给指定目的地。我们采用最近提出的概念，即信息时代（AOI），以表征状态更新的及时性。我们提出了一个以年龄为导向的机会传递（AOR）协议来减少所考虑系统的AOI。具体而言，继电器的机会替代了源以重新传输未正确传递到目的地的成功接收的状态更新，但是可以通过在源源的新状态更新到达来抢占继电器的重传。通过仔细分析AOI的演变，我们为提出的AOR方案得出了平均AOI的封闭形式表达。我们通过优化源状态更新的生成概率进一步最小化AOI。仿真结果验证了我们的理论分析，并证明所提出的AOR协议的平均AOI性能优于非合作系统的AOI。
This paper considers a cooperative status update system with a source aiming to send randomly generated status updates to a designated destination as timely as possible with the help of a relay. We adopt a recently proposed concept, Age of Information (AoI), to characterize the timeliness of the status updates. We propose an age-oriented opportunistic relaying (AoR) protocol to reduce the AoI of the considered system. Specifically, the relay opportunistically replaces the source to retransmit the successfully received status updates that have not been correctly delivered to the destination, but the retransmission of the relay can be preempted by the arrival of a new status update at the source. By carefully analyzing the evolution of AoI, we derive a closed-form expression of the average AoI for the proposed AoR protocol. We further minimize the average AoI by optimizing the generation probability of the status updates at the source. Simulation results validate our theoretical analysis and demonstrate that the average AoI performance of the proposed AoR protocol is superior to that of the non-cooperative system.
