Battle between Rate and Error in Minimizing Age of Information
Battle between Rate and Error in Minimizing Age of Information
复制标题
最小化信息时代的速度与错误之间的斗争
DOI:
10.1145/3466772.3467041
复制
发表时间:
2021
期刊:
影响因子:
--
通讯作者:
Shroff, Ness B.
中科院分区:
文献类型:
--
作者:
Yao, Guidan;Bedewy, Ahmed M.;Shroff, Ness B.
In this paper, we consider a status update system, in which update packets are sent to the destination via a wireless medium that allows for multiple rates, where a higher rate also naturally corresponds to a higher error probability. The data freshness is measured using age of information, which is defined as the age of the recent update at the destination. A packet that is transmitted with a higher rate, will encounter a shorter delay and a higher error probability. Thus, the choice of the transmission rate affects the age at the destination. In this paper, we design a low-complexity scheduler that selects between two different transmission rate and error probability pairs to be used at each transmission epoch. This problem can be cast as a Markov Decision Process. We show that there exists a threshold-type policy that is age-optimal. More importantly, we show that the objective function is quasi-convex or non-decreasing in the threshold, based on the system parameters values. This enables us to devise a low-complexity algorithm to minimize the age. These results reveal an interesting phenomenon: While choosing the rate with minimum mean delay is delay-optimal, this does not necessarily minimize the age.
影响因子:
10.4
作者:
Du, Xu;Sun, Yin;Shroff, Ness B.;Sabharwal, Ashutosh
通讯作者:
Sabharwal, Ashutosh
DOI:
10.1145/1874391.187410
发表时间:
1987-02
期刊:
ACM SIGSOFT Softw. Eng. Notes
影响因子:
--
作者:
Will Tribbey
通讯作者:
Will Tribbey
DOI:
10.1145/3323679.3326510
发表时间:
2018-12
期刊:
Proceedings of the Twentieth ACM International Symposium on Mobile Ad Hoc Networking and Computing
影响因子:
--
作者:
A. Bedewy;Yin Sun;S. Kompella;N. Shroff
通讯作者:
A. Bedewy;Yin Sun;S. Kompella;N. Shroff