Enhancing throughput viz-a-viz fairness in uplink diversity based VMIMO femtocell environment

Abstract

Maximization of throughput yet maintaining fairness among paired user equipments (UEs) in uplink Virtual Multiple-Input Multiple-Output (VMIMO) system is a great challenge in 3 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rd</sup> Generation (3G) Long-Term Evolution (LTE). In VMIMO strategy, different UEs with single antenna are paired together to achieve multiplexing/ diversity gains in uplink transmission. User pairing scenario poses a challenge on how to pair two UEs together for achieving maximum system throughput yet maintaining fairness among UEs in Femtocell environment. In this paper, we propose a novel adaptive round robin scheduling (A-RRS) scheme which gives a tradeoff between throughput and fairness in single user VMIMO (SU-VMIMO) and Multiple User VMIMO (MU-VMIMO) scenarios. Simulation results show that the proposed A-RRS scheme outperform other traditional pairing schemes, i.e., Round robin scheduling (RRS), Proportional Fair scheduling (PFS) and Random pairing scheduling (RPS) etc in throughput Vs fairness criteria.