Proceedings ArticleDOI
Rate analysis and feasibility of dynamic TDD in 5G cellular systems
Abhishek K. Gupta,Mandar N. Kulkarni,Eugene Visotsky,Frederick W. Vook,Amitava Ghosh,Jeffrey G. Andrews,Robert W. Heath +6 more
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TLDR
With appropriate interference mitigation, dynamic TDD offers a significant gain in data rates as compared to static TDD, which is higher when the BSs are lightly loaded and/or the fraction of UL users is low.Abstract:
In conventional applications of time division duplex (TDD) in cellular systems, the time resource split between uplink (UL) and downlink (DL) is fixed across all base stations (BSs) in the network. This leads to under utilization of BS resources when there is a mismatch between the expected and experienced UL/DL traffic in a given cell. A dynamic split that varies in each cell is desirable, but is challenging due to the high interference experienced by UL receivers in one cell from DL transmissions in adjacent cells. This paper analyzes the performance of UL users in dynamic TDD enabled next generation cellular networks using a stochastic geometry framework. The analysis highlights the trade-off between spectral efficiency and resource utilization for dynamic TDD. With appropriate interference mitigation, dynamic TDD offers a significant gain in data rates as compared to static TDD, which is higher when the BSs are lightly loaded and/or the fraction of UL users is low.read more
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Journal ArticleDOI
Modeling and Analyzing Millimeter Wave Cellular Systems
Jeffrey G. Andrews,Bai Tianyang,Mandar N. Kulkarni,Ahmed Alkhateeb,Abhishek K. Gupta,Robert W. Heath +5 more
TL;DR: A baseline analytical approach based on stochastic geometry that allows the computation of the statistical distributions of the downlink signal-to-interference-plus-noise ratio (SINR) and also the per link data rate, which depends on the SINR as well as the average load is presented.
Journal ArticleDOI
Downlink Cellular Network Analysis With LOS/NLOS Propagation and Elevated Base Stations
TL;DR: It is shown that network densification eventually leads to near-universal outage even for moderately low BS densities: in particular, the maximum area spectral efficiency is proportional to the inverse of the square of the BS height.
Proceedings ArticleDOI
On the performance of practical ultra-dense networks: The major and minor factors
Ming Ding,David Lopez-Perez +1 more
TL;DR: In this paper, the authors conduct performance evaluation for UDNs and identify which modelling factors play major roles and minor roles in UDN performance, and draw the following conclusions: 1) a multi-piece path loss model with line-of-sight (LoS) and non-line-ofsight (NLoS), ii) a non-zero antenna height difference between base stations (BSs) and user equipments (UEs), iii) a finite BS/UE density, and iv) a deterministic BS/user density.
Journal ArticleDOI
Performance of Dynamic and Static TDD in Self-Backhauled Millimeter Wave Cellular Networks
TL;DR: In this paper, a random spatial model is proposed to analyze uplink and downlink signal to interference plus noise ratio distribution and mean rates corresponding to different access-backhaul and UL-DL resource allocation schemes in a self-hauled mm-wave cellular network with Poisson point process (PPP) deployment of users and BSs.
Journal ArticleDOI
Performance of Dynamic and Static TDD in Self-backhauled mmWave Cellular Networks
TL;DR: This paper proposes PPP approximations to characterize the distribution of the new types of interference encountered with dynamic TDD and UAB, and focuses on heuristic implementations of static and dynamic time division duplexing for access links with synchronized or unsynchronized access-backhaul (SAB or UAB) time splits.
References
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