Tradeoff Between Latency and Throughput in 5G Networks with Hybrid-ARQ Retransmissions

Abstract

Ultra-reliable Low Latency Communications (URLLC) is one of the key enabling technology in Fifth Generation New Radio (5G-NR), which promises to provide reliability and ultra-low latency communication link for different mission critical and remote operations. To make it possible different retransmission schemes and error correction techniques are used in 5G-NR to minimize the delay and increase the reliability of the data packet transmission under variant wireless channel conditions.The main purpose of this thesis is to find the trade-off between throughput and latency in the network by simulating different Modulation and Coding Schemes (MCSs) under varying channel conditions. The Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform is used for downlink data transmission. The waveform is propagated through different noisy channel conditions. The throughput and delay, in terms of required retransmissions, are then estimated on the successful packet reception by the receiver and the subframe retransmissions by hybrid-ARQ during the simulation respectively. By executing various MCSs different graphs are generated and results are concluded. Based on these conclusions robust modulation schemes with coding rates are suggested for the critical applications, whose requirements are very strict in terms of reliability and a threshold level of data rate. In addition, a literature study is done on the 5G-NR radio interference architecture, waveform, data channels, transport channel process and the working mechanism of retransmission protocols for the data transmissions. Thus, this flourish the basic understanding of the overall process involved throughout the simulations