Low Latency Random Access for Sporadic MTC Devices in Internet of Things

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This paper proposes a compressed sensing-based random access protocol (CS-RACH), which is suitable for servicing a large number of machine-type communication devices in Internet of Things (IoT) network. In CS-RACH, we utilize a larger number of unique preambles compared to conventional LTE-RACH, however, the compressed sensing technique makes it possible to simultaneously detect the users with high accuracy. Compared to the user detection in conventional LTE-RACH, the proposed user detection can get rid of preamble collisions and decrease the collision probability, thereby the overall access latency is significantly reduced. To prove the benefits of the proposed CS-RACH, we mathematically analyze and compare access latency performance of LTE-RACH and CS-RACH. In particular, based on the least absolute shrinkage and selection operator approach, we derive a normalized throughput, access success probability, and average access latency. Our simulation results also exhibit that the proposed CS-RACH considerably reduces the access latency under reasonable conditions in IoT environments.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2019-06
Language
English
Article Type
Article
Citation

IEEE INTERNET OF THINGS JOURNAL, v.6, no.3, pp.5108 - 5118

ISSN
2327-4662
DOI
10.1109/JIOT.2019.2896620
URI
http://hdl.handle.net/10203/263313
Appears in Collection
EE-Journal Papers(저널논문)
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