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CeRA-eSP: Code-Expanded Random Access to Enhance Success Probability of Massive MTC.

Jiseung Youn1, Joohan Park2, Joohyun Oh1

  • 1Department of Applied Artificial Intelligence, Hanyang University, Ansan 15588, Korea.

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|October 27, 2022
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Summary

This study introduces code-expanded random access (CeRA) to improve cellular network access for massive machine-type communication (mMTC) devices. The new CeRA scheme significantly boosts the success rate and reduces delay for mMTC services.

Keywords:
Internet of Thingscode-expanded random accessmassive machine-type communicationsrandom access

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Area of Science:

  • Wireless communication networks
  • Internet of Things (IoT) technologies

Background:

  • Massive machine-type communication (mMTC) services in cellular networks face resource limitations during initial access for numerous devices.
  • High collision rates during random access are a significant challenge for mMTC services.
  • Existing efficient preamble transmission studies struggle to support a large number of simultaneous devices.

Purpose of the Study:

  • To address the challenges of resource scarcity and high collision rates in mMTC initial access.
  • To investigate and improve the code-expanded random access (CeRA) scheme.
  • To propose an optimal preamble codeword set selection algorithm for CeRA.

Main Methods:

  • Investigated code-expanded random access (CeRA) by extending preamble resources into the code domain.
  • Developed an optimal preamble codeword set selection algorithm based on mathematical analysis.
  • Simulated the proposed CeRA scheme to evaluate its performance.

Main Results:

  • The proposed code-expanded random access scheme to enhance success probability (CeRA-eSP) reduces the phantom codeword and PUSCH resource shortage issues.
  • CeRA-eSP demonstrates a higher random access success rate compared to existing schemes.
  • The enhanced CeRA scheme achieves a lower access delay.

Conclusions:

  • The proposed optimal preamble codeword set selection algorithm effectively solves existing CeRA limitations.
  • CeRA-eSP offers a viable solution for improving mMTC services in cellular networks.
  • The enhanced CeRA scheme significantly improves the efficiency and reliability of massive IoT device access.