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The random-access procedure (RAP) is the first step for User Equipment (UE) to establish a connection with the network. Its reliable connection is crucial to subsequent data transmission. Therefore, for the access of a large number of devices, how to reduce access congestion, improve throughput, and reduce access delay poses a challenge to random access (RA) technology. This paper firstly studies the RAP of 4-Step and 2-Step, and analyzes their similarities and differences in transmission formats and application scenarios. Secondly, for Massive Machine Type Communications (mMTC) access, the conflict caused by selecting the same preamble problem, summarizing the current conflict resolution. For 4-Step RA and 2-Step RA, it is difficult to meet the requirements of 6G that the air interface delay is less than 0.1ms, low power consumption, and network transmission reliability should reach 99.99%. Finally, we analyzed possible RA schemes and challenges.

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Improving Random Access Procedures for Next-Generation Networks

  • 会议论文

  • 发表日期：

    2025年

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  • Ganqiu Du,
  • Jing Su,
  • Quan Zhou

摘要

The random-access procedure (RAP) is the first step for User Equipment (UE) to establish a connection with the network. Its reliable connection is crucial to subsequent data transmission. Therefore, for the access of a large number of devices, how to reduce access congestion, improve throughput, and reduce access delay poses a challenge to random access (RA) technology. This paper firstly studies the RAP of 4-Step and 2-Step, and analyzes their similarities and differences in transmission formats and application scenarios. Secondly, for Massive Machine Type Communications (mMTC) access, the conflict caused by selecting the same preamble problem, summarizing the current conflict resolution. For 4-Step RA and 2-Step RA, it is difficult to meet the requirements of 6G that the air interface delay is less than 0.1ms, low power consumption, and network transmission reliability should reach 99.99%. Finally, we analyzed possible RA schemes and challenges.