Dynamic-TDD interference tractability approaches and performance analysis in macro-cell and small-cell deployments
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Dynamic-TDD interference tractability approaches and performance analysis in macro-cell and small-cell deployments Jalal Rachad1,2 · Ridha Nasri1 · Laurent Decreusefond2 Received: 22 September 2019 / Accepted: 18 June 2020 © Institut Mines-T´el´ecom and Springer Nature Switzerland AG 2020
Abstract Meeting the continued growth in data traffic volume, Dynamic Time Division Duplex (D-TDD) has been introduced as a solution to deal with the uplink (UL) and downlink (DL) traffic asymmetry, mainly observed for dense heterogeneous network deployments, since it is based on instantaneous traffic estimation and provide more flexibility in resource assignment. However, the use of this feature requires new interference mitigation schemes capable of handling two additional types of interference between cells in opposite transmission direction: DL to UL and UL to DL interference. The aim of this work is to provide a complete analytical approach to model inter-cell interference in macro-cell and dense small-cell networks. We derive the explicit expressions of Interference to Signal Ratio (ISR) at each position of the network, in both DL and UL, to quantify the impact of each type of interference on the system performance. Also, we provide the explicit expressions of the coverage probability as functions of different system parameters by covering different scenarios. Finally, through system-level simulations, we analyze the feasibility of D-TDD implementation in both deployments and we compare its performance to the static-TDD (S-TDD) configuration. Keywords Dynamic TDD · Interference · Macro-cells · Small-cells · Coverage probability · SINR · ISR · ASE · FeICIC
1 Introduction 1.1 Context of the study As the number of mobile users and the volume of data traffic are expected to continue increasing in the upcoming years, future mobile cellular networks need to support this proliferation through upgrading their features and key technologies. The upcoming fifth generation (5G) of cellular network radio interface, known as New Radio (NR), is being
Jalal Rachad
[email protected]; [email protected] Ridha Nasri [email protected] Laurent Decreusefond [email protected] 1
Orange Labs, Chatillon, France
2
LTCI, Telecom Paris, Institut Polytechnique de Paris, Palaiseau, France
designed by considering flexibility in feature definition in order to satisfy diverse use cases with different users’ requirements. Dynamic Time Division Duplex (D-TDD) is expected to be one of the major keys of 5G NR. It has been proposed in order to deal with traffic asymmetry since it enables the dynamic adjustment of UL and DL resource assignment according to the instantaneous traffic variations. However, the D-TDD system is severely limited by a strong mutual interference between the UL and DL transmissions because those two directions share the same frequency band. Hence, two types of interference appear: DL to UL (impact of DL other cell interference on UL signal received by the studied cell) and UL to DL (impact o
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