Abstract
Original TCP design is not agile enough to fit the rapidly varying mobile network bandwidth. In this paper, we revisit the Channel Quality Indicator Control (CQIC) congestion control algorithm and adapt its implementation from 3G/QUIC semantic to LTE/TCP with detailed congestion reaction gestures. We then compare its performance with that of the brand new TCP congestion control BBR — yet already widely deployed. We also identify the reason for performance degradation of high data rate downloads in LTE Acknowledged Mode (AM, which is turned on by default). Furthermore, impacts of the commonly encountered DelAck (delayed acknowlegment) feature are analyzed for both congestion control algorithms e.g. BBR and CQIC.
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