具有优先级的多跳网络中的信息年龄
Age of Information in Multi-hop Networks with Priorities
摘要：
信息时代是一个新的指标，用于实时状态更新跟踪应用程序。它在目的地测量自生成最后一个接收到的数据包以来所经过的时间。在本文中，我们考虑的两跳系统中的关键和非关键状态更新的共存，网络分配不同的调度优先级。具体地，高优先级被保留给穿过两个节点的分组，因为它们经历更差的延迟性能。我们得到的年龄分布和它的自然上限称为峰值年龄。我们提供了严格的上界和下界的优先级更新和精确的表达式的非关键流的数据包与一般的服务分布。研究结果为年龄敏感的多跳系统的设计提供了基本的见解。
英文摘要：
Age of Information is a new metric used in real-time status update tracking applications. It measures at the destination the time elapsed since the generation of the last received packet. In this paper, we consider the co-existence of critical and noncritical status updates in a two-hop system, for which the network assigns different scheduling priorities. Specifically, the high priority is reserved to the packets that traverse the two nodes, as they experience worse latency performance. We obtain the distribution of the age and its natural upper bound termed peak age. We provide tight upper and lower bounds for priority updates and the exact expressions for the non-critical flow of packets with a general service distribution. The results give fundamental insights for the design of age-sensitive multi-hop systems.
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