Perils of using CQIC in LTE network and a quick fix with delayed ACK

In this poster, we revisit the CQIC congestion control and adapt the implementation from 3G/QUIC semantic to LTE/TCP. We identify the reason for performance degradation of End-to-End (E2E) high data rate connection-oriented download in LTE Acknowledgement Mode (AM, which is turned on by default) and further recommend to turn on the Delayed Acknowledgement (DelAck) feature for TCP-CQIC, or more generally, for all the high speed E2E connections in LTE-AM mode. Finally, an NS3 simulation of TCP-CQIC and TCP-CQIC-DelAck with TCP Cubic and Westwood as a bench mark is made.