Hardware Implementation of Cell-Free MIMO and Dynamic TDD using the OAI 5G NR Codebase

Kamboj, H and Anand, B and Gupta, S and Meshram, A and Balijepalli, S and Murthy, CR (2021) Hardware Implementation of Cell-Free MIMO and Dynamic TDD using the OAI 5G NR Codebase. In: 25th International ITG Workshop on Smart Antennas, WSA 2021, 10-12 November 2021, French Riviera, pp. 362-366.

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Abstract

The cell-edge user in a traditional cellular network experiences degraded quality of service compared to a user at the centre of the cell due to path loss and interference from neighboring base stations (BSs). Cell-free multiple input and multiple output (MIMO) is a promising technology that can improve the cell-edge performance as it offers macro-diversity and consequently improved coverage and throughput. Moreover, the network capacity in a cellular network is often underutilized due to a static time division duplex (TDD) configuration coupled with asymmetric traffic demands in neighboring cells. To handle heterogeneous traffic demands, dynamic TDD is considered to be a beneficial technology, wherein different cells can independently schedule slots in the uplink (UL)/downlink (DL) directions depending on their local traffic demands. However, dynamic TDD brings new challenges because of the introduction of cross-link interferences (CLI) between users and between BSs. Combining cell-free MIMO with dynamic TDD can effectively overcome the CLI, as there exists inbuilt co-operation between the access points (APs) in the cell-free MIMO architecture. This paper presents a hardware implementation of cell-free MIMO and dynamic TDD using the OPENAIRINTERFACE (OAI) 5G new radio (NR) software stack, with the aim to experimentally understand the role of cell-free MIMO and dynamic TDD in providing better connectivity at the cell-edge and improving network throughput.

Item Type:	Conference Paper
Publication:	WSA 2021 - 25th International ITG Workshop on Smart Antennas
Publisher:	VDE VERLAG GMBH
Additional Information:	The copyright for this article belongs to VDE VERLAG GMBH.
Keywords:	5G mobile communication systems; Cells; Cytology; Quality of service; Wireless networks, 5g new radio; Cell edges; Cell-free; Cell-free multiple input and multiple output; Dynamic time; Dynamic time division duplex; Multiple input and multiple outputs; Openairinterface; Time division duplex; USRP, Time division multiplexing
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	08 Mar 2023 13:06
Last Modified:	08 Mar 2023 13:06
URI:	https://eprints.iisc.ac.in/id/eprint/80877

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