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[Vinay: ICC 2024] TCP Throughput over Full-Duplex WLANs

Full-duplex (FD) communication promises to double the throughput of wireless local area networks (WLANs) by allowing simultaneous transmission and reception of data. While the benefits of FD on the medium access control (MAC) layer throughput of IEEE 802.11 WLANs are well-studied, the interaction between the transmission control protocol (TCP) and the FD MAC layer is less explored. We consider TCP file uploads and downloads between stations (STAs) and a server via an FD access point (AP). Using a novel FD-specific saturation approximation, Markov renewal theory, and fixed point analysis, we derive novel expressions for the TCP upload and download saturation throughputs. These expressions differ from those derived in the literature for TCP over half-duplex (HD) WLANs, and bring out how the AP is no longer a bottleneck. Despite greater contention between STAs, cross-link interference between transmitting and receiving STAs, and asymmetric payloads due to the different sizes of TCP data packets and TCP acknowledgments, we find that an FD WLAN achieves a significantly higher TCP throughput than a conventional HD WLAN.