Non-terrestrial networks (NTNs) are a key feature to be supported in the next-generation mobile network. The contention-based 2-step (grant-free) and 4-step (grant-based) random access (RA) procedures used in existing terrestrial networks will be adopted in NTNs. In applying the 2-step and 4-step RA in NTNs, the preamble configuration is a critical factor affecting the performance of the random access channel (RACH). In this paper, we present a general system model to investigate the impact of preamble configuration and the RACH parameters of the 2-step and 4-step RAs (i.e, random access response (RAR) window size, maximum transmission time, and back-off window size) on the access success probability, average access delay, and the use of resources under different offered loads. Simulations were conducted to investigate the pros and cons of 2-step and 4-step RAs under various conditions.
Performance Evaluation of Contention-based Random Access Procedure in Non-Terrestrial Networks
2024-06-24
2798144 byte
Conference paper
Electronic Resource
English
Asymmetric Internet Access over Satellite-Terrestrial Networks
British Library Conference Proceedings | 1996
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