Performance Analysis of HARQ in LTE Networks

Hybrid Automatic Repeat Request (HARQ) is used in wireless communication systems to provide reliable data transmission. It is a combination of Automatic Repeat Request (ARQ) along with Forward Error Correction (FEC). In this paper, we analyse the Signal to Noise Ratio (SNR) gain that is obtained with HARQ combining using multiple retransmissions compared to the case when a single transmission is used. The simulations are carried out both for the uplink and downlink scenarios for all possible modulation and coding schemes (MCS) in Long Term Evolution (LTE).