1 research outputs found
Technical Report on Efficient Integration of Dynamic TDD with Massive MIMO
Recent advances in massive multiple-input multiple-output (MIMO)
communication show that equipping base stations (BSs) with large arrays of
antenna can significantly improve the performance of cellular networks. Massive
MIMO has the potential to mitigate the interference in the network and enhance
the average throughput per user. On the other hand, dynamic time division
duplexing (TDD), which allows neighboring cells to operate with different
uplink (UL) and downlink (DL) sub-frame configurations, is a promising
enhancement for the conventional static TDD. Compared with static TDD, dynamic
TDD can offer more flexibility to accommodate various UL and DL traffic
patterns across different cells, but may result in additional interference
among cells transmitting in different directions. Based on the unique
characteristics and properties of massive MIMO and dynamic TDD, we propose a
marriage of these two techniques, i.e., to have massive MIMO address the
limitation of dynamic TDD in macro cell (MC) networks. Specifically, we
advocate that the benefits of dynamic TDD can be fully extracted in MC networks
equipped with massive MIMO, i.e., the BS-to-BS interference can be effectively
removed by increasing the number of BS antennas. We provide detailed analysis
using random matrix theory to show that the effect of the BS-to-BS interference
on uplink transmissions vanishes as the number of BS antennas per-user grows
infinitely large. Last but not least, we validate our analysis by numerical
simulations.Comment: 24 pages, 8 figure