Age of Information in Grant-Free Random Access With Massive MIMO

This letter aims to analyze and optimize the status update performance in a grant-free random access system with massive multiple-input multiple-output. We analyze the status update process, and derive a closed-form approximate expression of the average age of information (AoI). Then, in the asympto...

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Bibliographic Details
Published in:IEEE wireless communications letters 2021-07, Vol.10 (7), p.1429-1433
Main Authors: Yu, Baoquan, Cai, Yueming
Format: Article
Language:English
Subjects:
Access control
Age of information
Analytical models
Base stations
Benchmark testing
Error analysis
grant-free random access
Information age
Massive MIMO
massive multiple-input multiple-output
Random access
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Summary:This letter aims to analyze and optimize the status update performance in a grant-free random access system with massive multiple-input multiple-output. We analyze the status update process, and derive a closed-form approximate expression of the average age of information (AoI). Then, in the asymptotic case where the large number of antennas at the base station causes the packet error rate to approach zero, we jointly optimize access control and pilot length to reduce the average AoI. Simulation and numerical results verify the correctness of the theoretical analysis, and show that the proposed scheme can achieve the same performance as the exhaustive search scheme and outperforms the benchmark ones.
ISSN:2162-2337
2162-2345
DOI:10.1109/LWC.2021.3069257