Does full-duplex double the capacity of wireless networks?

Xiufeng Xie, Xinyu Zhang
2014 IEEE INFOCOM 2014 - IEEE Conference on Computer Communications  
Full-duplex has emerged as a new communication paradigm and is anticipated to double wireless capacity. Existing studies of full-duplex mainly focused on its PHY layer design, which enables bidirectional transmission between a single pair of nodes. In this paper, we establish an analytical framework to quantify the network-level capacity gain of full-duplex over halfduplex. Our analysis reveals that inter-link interference and spatial reuse substantially reduces full-duplex gain, rendering it
more » ... ll below 2 in common cases. More remarkably, the asymptotic gain approaches 1 when interference range approaches transmission range. Through a comparison between optimal half-and fullduplex MAC algorithms, we find that full-duplex's gain is further reduced when it is applied to CSMA based wireless networks. Our analysis provides important guidelines for designing full-duplex networks. In particular, network-level mechanisms such as spatial reuse and asynchronous contention must be carefully addressed in full-duplex based protocols, in order to translate full-duplex's PHY layer capacity gain into network throughput improvement.
doi:10.1109/infocom.2014.6847946 dblp:conf/infocom/XieZ14 fatcat:wpfz4exbjnhonjxwv5kf3myp54