2020 IEEE Region 10 Symposium (TENSYMP), 5-7 June 2020, Dhaka, Bangladesh Investigation of TCP Performance in 5G mmWave Networks 1 Md. Tarek Hassan Dept. of Electronics & Telecommunication Engineering Rajshahi University of Engineering & Technology Rajshahi, Bangladesh Email: Tarekruet024@gmail.com 2 Md. Munjure Mowla Dept. of Electronics & Telecommunication Engineering Rajshahi University of Engineering & Technology Rajshahi, Bangladesh Email: rimonece@gmail.com Abstract—The millimeter wave (mmWave) communication is now considered as a predominant technology for fifth generation (5G) systems to meet the surging needs of traffic by ensuring massive bandwidth with high dimensional antennas. However, transmission control protocol (TCP) analysis due to mobility is still complex in nature. In addition, packet trip length, i.e., round trip time (RTT) and length of congestion window (CWND) need to be more investigated. In this paper, the executed framework of mmWave channel modeling has been inspected with ns-3 simulator. In this research, we consider several mobility models (e.g., constant mobility, Gaussian Markov, and random direction 2D) for a UE who is using mmWave link to communicate with eNB to transfer its traffic. These TCP analysis may be utilized to exhibit the potential of 28 GHz mmWave band and its worthy for the design of future 5G networks. Index Terms—5G, millimeter wave, TCP performance, RTT, CWND, ns-3. I. I NTRODUCTION Wireless connectivity has become part and parcel of our society nowadays. More than 50 billion connected devices will be using the cellular network services by the closing of the year 2022. This encourages the development of 5G networks because of tremendous increase in data traffic, as compared to 2015. A spectrum shortage problem arises because of increasing traffic number in different sectors. The existing technology may not support the upcoming huge demands whereas millimeter wave (mmWave) band with huge band- width 30 GHz to 300 GHz will be an important part of the 5G Wireless communication system. Current researches are focused on the 28 GHz band and 38 GHz while there is a huge spectrum. The another bands v bands (60 GHz) and E-bands having many advantages like narrow beamforming capability and high data transmission rate with huge capacity. Cellular access, wireless backhaul and small cell access are the efficient applications of mmWave for 5G. The wireless channel bandwidths for 5G mmWave will be more than ten times greater than current 4G 20 MHz wireless channels. The existing 4G technology furnishes the previous features as 3G with a few additional features and services but the main remarkable increment of data transfer rate from 2 Mbps to 100 Mbps supported the telecommunication monsters to spot the advanced features as a upcoming generation altogether. The main reason for that kind of high speeds needed bearing in our mind the extreme requirement of video. Some high speed traffic cases such as aeroplanes, bullet trains etc. require a stable internet connection while travelling at a great speed and altitude. 4G demands costly and tangled hardware and with the surfacing of 5G, the upcoming technology will remain for many years. An increased level of video streaming by customers on 4G networks is often cited by operators as a major contributing factor to this [1]. The millimeter-wave region of the electromagnetic spectrum is usually estimated to be the range of wavelengths from 10 mm to 1 mm. The millimeter-wave region of the elec- tromagnetic spectrum corresponds to radio band frequencies from 30 GHz to 300 GHz and is sometimes defined as the Extremely High Frequency (EHF) [2]. Supporting large amount of data needs is One of the greatest and most vital uses of millimeter waves for 5G . Almost every kind of wireless communication, such as the radio, cell phone, or satellite, uses specific range of frequencies. Each application provider such as radio broadcaster or a local television who has a individual “channel” allocation, without interfering each other, they can communicate. Natural impact such as rain, humidity, and spatial consistency can impact performance and decrease received signal strength. In order to transmit this wave we require multiple cells in case of wireless back-hauling [3]. Channel models are necessary for simulating parameters for propagation behaviour in a reliable and closefisted manner are used to model and compare the requires system development accurately. Channel models explains how the wireless channel parameters will behave for a special scenario, and provide evaluation of system level performance [4]. To construct the standardized equipment and systems globally, Common 978-1-7281-7366-5/19/$31.00 ©2020 IEEE