Performance Evaluations of TCP in 5G mmWave Cellular Network

초록

The wide bandwidth of the millimeter-wave (mmWave) band can provide multi-gigabit per second data rate services to meet the high demand for fast data rates. However, high bandwidth mmWave channels suffer from very large and frequent degradation of the received signal quality due to blocking. These highly dynamic channel conditions can significantly degrade the end-to-end performance of TCP, the most widely used transport layer protocol. In this paper, we examined the problems that TCP may experience in 5G mmWave cellular networks and conducted various experiments related to TCP using mmWave links. Experiments confirmed that the large variability of the mmWave band causes excessive queuing delay, and the link-layer retransmission mechanism applied to the cellular network serves to hide the status of the radio channel from the upper layer TCP, thereby further accelerating queue creation. Active queue management policy can reduced queuing delay, but end-to-end throughput is reduced due to low buffer utilization. Therefore, a new congestion control algorithm that can fully utilize the available capacity of the mmWave link is needed, and a way to lower the delay through cooperation with the queue management policy should be sought. © 2021, Korean Institute of Communications and Information Sciences. All rights reserved.

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