Abstract
How to support massive access efficiently is one of the challenges in the future Internet of Things (IoT) systems. To address such challenge, this paper proposes an effective preamble collision resolution scheme to sustain massive random access (RA) for an IoT system. Specifically, a new sub-preamble structure is first proposed to reduce the preamble collision probability. To identify different devices that send the same preamble to the gNB on the same physical random access channel (PRACH), a multiple timing advance (TA) capturing scheme is then proposed. Thereafter, an RA scheme is designed to sustain massive access and the performance of the scheme is studied analytically. Finally, the effectiveness of the proposed RA scheme is validated by extensive simulation experiments in terms of preamble detection probability, preamble collision probability, RA success probability, resource efficiency and TA capturing.
Highlights
The rapid evolution of the wireless communication technologies are inviting all human beings to the era of the Internet of Everything [1]
timing advance (TA) values are transmitted to the gNB, suffering from a small-scale fading channel and additive white Gaussian noise
A preamble collision resolution scheme was proposed for the Internet of Things (IoT) systems
Summary
The rapid evolution of the wireless communication technologies are inviting all human beings to the era of the Internet of Everything [1]. It is necessary to design new preamble structure and RA scheme to reduce the congestion for the physical random access channel (PRACH). The idea of resource reusing can allow multiple devices to send identical preambles on the same PRACH, which is applicable to the massive access scenario. How to design a preamble structure and an RA scheme to efficiently reuse the PRACH resources for a massive access IoT system is still an open problem. This paper proposes an effective preamble collision resolution scheme to sustain massive random access for an IoT system. Based on the new designed preamble, a TA capturing scheme is proposed to identify multiple devices that send identical sub-preambles to the gBN on the same PRACH.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
