Enhanced Random Access for Massive-Machine-Type Communications

doi:10.1109/JIOT.2020.3038148

Enhanced Random Access for Massive-Machine-Type Communications

2021-04-15

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DOI：10.1109/JIOT.2020.3038148

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In this article, we study a random access (RA) scheme to alleviate the RA channel (RACH) overload problem in the massive-machine-type communication (mMTC) environment. We first propose a timing advance-based preamble resource expansion (TAPRE) scheme which effectively increases preamble resources and reduces the preamble collision probability by adjusting preamble transmission timing with timing advance (TA) information. We also propose a resource allocation wait (RAW) scheme which efficiently reduces the number of RA failures due to the lack of physical uplink shared channel (PUSCH) resources. We then propose an overall procedure for enhanced RA with TAPRE and RAW (ERATAR). In addition, we provide the analysis of RA performance by applying more practical assumptions than the existing analysis. We validate our analysis with the system level simulation based on NS-3, and compare the various performances of our ERATAR to those of existing works. Numerical results show that our analysis provides more accurate results than the existing work and our ERATAR provides significantly improved performances compared with those of existing works.

Keywords:

Internet of Things

Resource management

Propagation delay

Uplink

Moon

Massive machine type communications

Delays

Fifth generation (5G)

Internet of Things (IoT)

massive-machine-type communication (mMTC)

new radio (NR)

random Access (RA)

timing advance (TA)

Enhanced Random Access for Massive-Machine-Type Communications

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