Impact of NOMA and CoMP Implementation Order on the Performance of Ultra-Dense Networks

TL;DR

This paper investigates how the order of implementing NOMA and CoMP affects the performance of ultra-dense networks, proposing user grouping schemes to optimize coverage and throughput trade-offs.

Contribution

It introduces two novel user grouping schemes that differ in the order of applying NOMA and CoMP, analyzing their impact on UDN performance.

Findings

Proposed schemes outperform existing methods in coverage and throughput.

Order of NOMA and CoMP implementation significantly influences system performance.

Numerical results demonstrate improved coverage-throughput trade-offs.

Abstract

Non-orthogonal multiple access (NOMA) is a promising multiple access technology to improve the throughput and spectral efficiency of the users for 5G and beyond cellular networks. Similarly, coordinated multi-point transmission and reception (CoMP) is an existing technology to improve the coverage of cell-edge users. Hence, NOMA along with CoMP can potentially enhance the throughput and coverage of the users. However, the order of implementation of CoMP and NOMA can have a significant impact on the system performance of Ultra-dense networks (UDNs). Motivated by this, we study the performance of the CoMP and NOMA based UDN by proposing two kinds of user grouping and pairing schemes that differ in the order in which CoMP and NOMA are performed for a group of users. Detailed simulation results are presented comparing the proposed schemes with the state-of-the-art systems with varying user and base station densities. Through numerical results, we show that the proposed schemes can be used to achieve a suitable coverage-throughout trade-off in UDNs.