An Enhanced Access Reservation Protocol with a Partial Preamble Transmission Mechanism in NB-IoT Systems

TL;DR

This paper introduces an improved access reservation protocol with a partial preamble mechanism for NB-IoT systems, reducing collisions and enhancing performance especially under heavy loads.

Contribution

It proposes a novel ARP with partial preamble transmission, providing an analytical model and load-based optimization for better performance in NB-IoT.

Findings

Outperforms conventional ARP at high system loads

Reduces preamble collisions and false alarms

Optimized for different system load conditions

Abstract

In this letter, we propose an enhanced Access Reservation Protocol (ARP) with a partial preamble transmission (PPT) mechanism for the narrow band Internet of Things (NB-IoT) systems. The proposed ARP can enhance the ARP performance by mitigating the occurrence of preamble collisions, while being compatible with the conventional NB-IoT ARP. We provide an analytical model that captures the performance of the proposed ARP in terms of false alarm, mis-detection and collision probabilities. Moreover, we investigate a trade-off between the mis-detection and the collision probabilities, and optimize the proposed ARP according to the system loads. The results show that the proposed ARP outperforms the conventional NB-IoT ARP, in particular at heavier system loads.