Full-duplex wifi networks

Abstract

The device in conventional half-duplex WiFi networks cannot perform carrier sensing while in data transmission; thus it suffers from long collision duration. To mitigate this problem, this chapter introduces full-duplex (FD) technology into WiFi networks. A novel CSMA/CD protocol design is first presented for singlechannel FD-WiFi, which facilitates continuous carrier sensing and transmission suspension. The network throughput performance is comprehensively analyzed by considering possible sensing errors (i.e., false alarm and miss detection) due to self-interference, and simulation results verify the performance analysis and the effectiveness of CSMA/CD protocol. Then the protocol for multi-channel FD WiFi is provided, where the CSMA/CD protocol for accessing a certain channel is modified by adopting a contention window adjustment rule, and a distributed channel selection strategy is proposed based on the best-response algorithm. Simulation results indicate the performance improvement of multi-channel FDWiFi protocol design.