Spatiotemporal Model for Uplink IoT Traffic: Scheduling and Random Access Paradox

The Internet-of-Things (IoT) is the paradigm where anything will be connected. There are two main approaches to handle the surge in uplink (UL) traffic that the IoT is expected to generate, namely, scheduled UL (SC-UL) and random access uplink (RA-UL) transmissions. SC-UL is perceived as a viable to...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2018-12, Vol.17 (12), p.8357-8372
Main Authors: Gharbieh, Mohammad, ElSawy, Hesham, Yang, Hong-Chuan, Bader, Ahmed, Alouini, Mohamed-Slim
Format: Article
Language:English
Subjects:
Data communication
grant-based access
grant-free access
interacting queues
Interference
Internet of Things
Internet of Things (IoT)
Queueing analysis
queueing theory
Queues
Queuing theory
Random access
Scalability
Scheduling
Signal to noise ratio
Spatiotemporal phenomena
stability analysis
stochastic geometry
Stochastic processes
Traffic models
uplink transmission
Wireless communication
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Summary:The Internet-of-Things (IoT) is the paradigm where anything will be connected. There are two main approaches to handle the surge in uplink (UL) traffic that the IoT is expected to generate, namely, scheduled UL (SC-UL) and random access uplink (RA-UL) transmissions. SC-UL is perceived as a viable tool to control quality-of-service levels while entailing some overhead in the scheduling request prior to any UL transmission. On the other hand, RA-UL is a simple single-phase transmission strategy. While this obviously eliminates scheduling overheads, very little is known about the scalability of RA-UL. At this critical junction, there is a dire need to analyze the scalability of these two paradigms. To that end, this paper develops a spatiotemporal mathematical framework to analyze and assess the performance of SC-UL and RA-UL. The developed paradigm jointly utilizes stochastic geometry and queuing theory. Based on such a framework, we show that the answer to the scheduling versus random access paradox actually depends on the operational scenario. Particularly, the RA-UL scheme offers low access delays but suffers from limited scalability, i.e., cannot support a large number of IoT devices. On the other hand, SC-UL transmission is better suited for higher device intensities and traffic rates.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2018.2876522