Paper Info
Title
Average Age of Information in Short Packet Based Machine Type Communication
Abstract
It is crucial to consider timely status updates for machine type communications (MTC) in some scenarios, where a controller continuously obtains state information of targets from a sender to complete control or monitoring tasks, such as vehicular networking and environmental detection. In this work, we measure the timeliness of the status by the recently proposed age of information (AoI) metric. Different from the previous works about AoI, we consider the short packet feature of MTC in our system, where status packets will suffer from a significant packet error rate. Considering that the status packets may not be decoded by the receiver correctly, this work investigates the performance of MTC under traditional protocol (the sender discards the error status packets directly) and automatic repeat-request (ARQ) protocol (the sender retransmits the error status packets), and obtains the approximated closed-form expressions of the average AoI, respectively. Based on the closed-form expressions of the average AoI, we design two suboptimal blocklengths to minimize the average AoI under the two protocols. Numerical results verify the correctness of theoretical analysis, and show that the proposed scheme can achieve almost the same optimization performance as the exhaustive search method. Moreover, in the case of different packet generation rates, we find that the ARQ/traditional protocol can achieve better performance in low/high packet generation rate scenarios, respectively.
Year
DOI
Venue
2020
10.1109/TVT.2020.3004828
IEEE Transactions on Vehicular Technology
Keywords
DocType
Volume
Protocols,Error analysis,Closed-form solutions,Delays,Numerical models,Information age
Journal
69
Issue
ISSN
Citations 
9
0018-9545
13
PageRank 
References 
Authors
0.56
0
4
Name
Order
Citations
PageRank
Baoquan Yu1283.19
Yueming Cai2161.97
Dan Wu3130.56
Zhongwu Xiang4395.94