Impact of Mobility on the Sum Rate of NB-OFDMA Based Mobile IoT Networks

TL;DR

This paper analyzes how device mobility affects the sum rate in NB-OFDMA-based IoT networks, providing insights for system design in mobile scenarios.

Contribution

It offers a detailed analysis of mobility impacts on inter-sub-carrier interference and system sum-rate in NB-OFDMA IoT networks, which was previously not well-characterized.

Findings

Mobility increases inter-sub-carrier interference in NB-OFDMA.

System sum-rate decreases as device mobility increases.

The relationship between mobility and interference informs better system design.

Abstract

In future Internet of Things (IoT) networks, the explosive growth of mobile devices compel us to reconsider the effectiveness of the current frequency-division multiple access (FDMA) schemes. Devices' differentiated mobility features and diversified scattering environments make it more complicated to characterize the multi-user interference. In this paper, we thoroughly analyze the impacts of devices' mobility on the inter-sub-carrier interference (ICI) in an IoT system based on the 3GPP narrow-band orthogonal frequency-division multiple access (NB-OFDMA) protocol, and obtain the relationship between the system sum-rate and devices' mobility. Our results may shed some lights on the system design under the mobile scenarios.