Effect of data channel multiplexing using symbol repetition considering asymmetric traffic load for full duplex

Compared to frequency division duplex (FDD) and time division duplex (TDD), full duplex (FD) is effective in improving frequency efficiency and in achieving flexible resource assignment. The key challenge to actualizing FD in cellular systems is to suppress sufficiently self-interference (SI) from the own transmitter using antenna isolation, an analog self-interference canceller, and a digital self-interference canceller (DSIC). This paper proposes a data channel multiplexing scheme employing symbol repetition according to the asymmetric traffic load for FD. The proposed scheme takes advantage of an asymmetric traffic load feature by efficiently converting data symbol multiplexing from the time domain to the power domain. Link-level simulation shows that the DSIC using the proposed symbol repetition suppresses the residual SI and achieves almost the identical average block error rate as that without SI. We also show the effect of extending the coverage area that satisfies the reference sensitivity level, which is specified in the long term evolution (LTE) radio interface, achieved through the application of symbol repetition to the uplink data channel for FD.