Cross-Layer Protocol Design for CSMA/CD in Full-Duplex WiFi Networks


The device in standard [*fr1]-duplex (HD) WiFi networks cannot perform carrier sensing while in information transmission, so it suffers from long collision period. To mitigate this drawback, this letter presents a brand new WiFi cross-layer protocol design primarily based on CSMA/CD, which facilitates simultaneous carrier sensing and information transmission by using the full-duplex (FD) technology. As the FD technology introduces the residual self-interference (RSI), we study 2 sorts of errors caused by the RSI against the FD-WiFi sensing (i.e., false alarm and miss detection). Meanwhile, we derive the normalized throughput when considering the sensing performance in the proposed FD-WiFi CSMA/CD protocol. Each analytical and simulated results show that sensing threshold should be properly designed to balance the 2 types of sensing errors, and our proposed cross-layer protocol can achieve significant throughput improvement.

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