On the Age of Information With Packet Deadlines
On the Age of Information With Packet Deadlines
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DOI:
10.1109/tit.2018.2818739
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发表时间:
2018-09-01
影响因子:
2.5
通讯作者:
Ephremides, Anthony
中科院分区:
文献类型:
--
作者:
Kam, Clement;Kompella, Sastry;Ephremides, Anthony
We study the age of information, which is a measure of the freshness of a continually updated piece of information as observed at a remote monitor. The age of information metric has been studied for a variety of different queueing systems, and in this paper, we introduce a packet deadline as a control mechanism to study its impact on the average age of information for an M/M/1/2 queueing system. We analyze the system for the cases of a fixed deadline and a random exponential deadline and derive closed-form expressions for the average age. We also derive a closed-form expression for the optimal average deadline for the random exponential case. Our numerical results show the relationship of the age performance to that of the M/M/1/1 and M/M/1/2 systems, and we demonstrate that using a deadline can outperform both the M/M/1/1 and M/M/1/2 without deadline.