Paper Info
Title
Joint User Scheduling, Precoder Design, and Transmit Direction Selection in MIMO TDD Small Cell Networks
Abstract
New short-length single-direction frame structures are proposed for 5G time division duplex (TDD) systems, where the transmit direction [i.e., either downlink (DL) or uplink (UL)] can be independently chosen at each cell in every frame. Accordingly, high flexibility is provided to match the per-cell DL/UL traffic asymmetries and full exploitation of dynamic TDD is allowed. As a downside, interference management becomes crucial. In this regard, this paper proposes a procedure for dynamic TDD in dense multiple-input multiple-output small cell networks, where the transmit direction selected per small cell (SC) is dynamically optimized together with the user scheduling and transmit precoding. We focus on the maximization of a general utility function that takes into account the DL/UL traffic asymmetries of each user and the interference conditions in the network. Although the problem is non-convex, it is decomposed thanks to the interference-cost concept and then efficiently solved in parallel. Simulation results show gains in DL and UL average rates for different traffic asymmetries and SC/user densities as compared to existing dynamic TDD schemes thanks to the proposed joint optimization. The gains become more significant when there is high interference and limited number of antennas.
Year
DOI
Venue
2017
10.1109/TWC.2017.2664837
IEEE Trans. Wireless Communications
Keywords
Field
DocType
Interference,Long Term Evolution,MIMO,5G mobile communication,Periodic structures,Dynamic scheduling,Optimization
Scheduling (computing),MIMO,Real-time computing,Interference (wave propagation),Small cell,Dynamic priority scheduling,Maximization,Mathematics,Precoding,Telecommunications link
Journal
Volume
Issue
ISSN
16
4
1536-1276
Citations 
PageRank 
References 
2
0.36
21
Authors
3
Name
Order
Citations
PageRank
Sandra Lagen17811.36
Adrian Agustin248753.41
J. Vidal363666.15