Abstract
As fifth generation (5G) networks are starting to become commercial, user expectations in terms of new services become high as well. This signifies that mobile communications service providers need to build robust 5G new services as quickly and cost-efficiently as possible. Many new technologies rely on closed-loop (CL) and multiple input multiple output (MIMO) technologies due to emerging cooperation between nodes in next generation networks. In this paper, we first compare different multiantenna transmission modes namely: transmit diversity, open-loop (OL), and CL MIMO spatial multiplexing strategies to provide mobile network operator (MNO) services in terms of their characteristics, ,limitations and benefits. Later we investigate how launching a large-scale CL MIMO deployment strategy can affect the various key performance indicators (KPIs) of the existing services provided by Mobile Network Operators (MNOs) in real-operational network infrastructure in Turkey. Our practical experimental results indicate that, compared to OL MIMO system, CL MIMO can achieve large performance on a practical setup, where up to 3% improvement in cell average throughput, 9% in user throughput, 6% in spectrum efficiency, and 9% in channel quality indicator (CQI) and modulation coding scheme (MCS) are obtained, while reduction by 25% and 17% on sum delay and initial block error rates (IBLER) are observed.
Highlights
The Fifth Generation (5G) networks are expected to provide low latency, massive connectivity, and high throughput to diverse set of applications and devices
Observation duration during which OL Multiple-input multiple-output (MIMO) was activated was between August and September 2018, whereas CL MIMO was activated in October 2018
The experiments were run in 6 major cities (İstanbul, İzmir, Antalya, Bursa, Kocaeli, and Adana) of Turkey that are located in different geographic regions and key performance indicators (KPIs) are averaged over all the considered locations
Summary
The Fifth Generation (5G) networks are expected to provide low latency, massive connectivity, and high throughput to diverse set of applications and devices. CL MIMO is shown to provide valuable signal-tointerference-plus-noise ratio (SINR) gains compared to OL MIMO via simulations even under Channel Status Information (CSI) feedback error scenarios in [14] Both of these approaches ([13, 14]) are based on system level simulations that lack experimentation with real-world operational environments inside a MNO infrastructure. Approaches different than the ones mentioned above (which are either focusing on simulation based studies or non-practical settings for experimenting with CL MIMO solution), we investigate the MIMO systems in the perspective of a service that is provided by MNOs in a real deployment scenario.
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