Abstract
To cope with the growing trend of asymmetric data traffic, we introduce a novel network assisted full duplex (NAFD) for a millimeter wave system. NAFD can dynamically allocate the number of remote radio heads in the uplink mode or in the downlink mode, which can facilitate simultaneous uplink and downlink communications. In this manuscript, we use stochastic geometry to analyze the distribution of the signal-to-interference-plus-noise ratio and the data rate in a NAFD system. The numerical results verify the analysis and show that the NAFD outperforms the dynamic time division duplex system and the traditional flexible duplex system in terms of spectral efficiency.
Highlights
Network densification by using small cells in fifth generation cellular communication systems (5G) could increase the traffic load between different cells significantly [1,2].In addition, as the popularization of various wireless smart devices and the surge of the user’s mobility, the traffic asymmetry between the uplink and downlink will continue to increase [3,4]
The results show that the network assisted full duplex (NAFD) outperforms the dynamic time division duplex (TDD) system and the traditional flexible duplex system in spectral efficiency
This section first uses the Monte Carlo simulations to verify the accuracy of the analytical results of the signal-to-interference-plus-noise ratio (SINR) coverage probability in Theorems 1 and 2
Summary
Network densification by using small cells in fifth generation cellular communication systems (5G) could increase the traffic load between different cells significantly [1,2].In addition, as the popularization of various wireless smart devices and the surge of the user’s mobility, the traffic asymmetry between the uplink and downlink will continue to increase [3,4]. Asymmetric FDD carrier aggregation can solve the problem, whereas leads to increased cost and power consumption [6,7]. Time division duplex (TDD) systems do not require paired frequencies. It can use an asymmetric time slot configuration in the uplink and downlink according to the actual situation [8,9]. Due to the asymmetry of spatio-temporal traffic, the synchronization slot configuration is extremely inefficient for small cellular networks. Xin et al [10] proposed a method of adjusting the number of base stations in the uplink or the downlink modes in a flexible manner to solve the traffic asymmetry problem.
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