Modeling Cellular Networks with Full Duplex D2D Communication: A Stochastic Geometry Approach

TL;DR

This paper uses stochastic geometry to analyze the large-scale impact of full-duplex D2D communication in cellular networks, revealing that careful parameter tuning is essential for spectral efficiency gains despite interference challenges.

Contribution

It introduces a new analytical framework for evaluating full-duplex D2D in cellular networks and identifies conditions under which spectral efficiency gains are achievable.

Findings

Perfect SIC does not guarantee benefits due to increased interference.

Careful system parameter tuning can achieve significant spectral efficiency gains.

Imperfect SIC and D2D link distances influence the potential benefits of FD-D2D communication.

Abstract

Full-duplex (FD) communication is optimistically promoted to double the spectral efficiency if sufficient self-interference cancellation (SIC) is achieved. However, this is not true when deploying FD-communication in a large-scale setup due to the induced mutual interference. Therefore, a large-scale study is necessary to draw legitimate conclusions about gains associated with FD-communication. This paper studies the FD operation for underlay device-to-device (D2D) communication sharing the uplink resources in cellular networks. We propose a disjoint fine-tuned selection criterion for the D2D and FD modes of operation. Then, we develop a tractable analytical paradigm, based on stochastic geometry, to calculate the outage probability and rate for cellular and D2D users. The results reveal that even in the case of perfect SIC, due to the increased interference injected to the network by FD-D2D communication, having all proximity UEs transmit in FD-D2D is not beneficial for the network. However, if the system parameters are carefully tuned, non-trivial network spectral-efficiency gains (64 shown) can be harvested. We also investigate the effects of imperfect SIC and D2D-link distance distribution on the harvested FD gains.