Pricing-Based Distributed Beamforming for Dynamic Time Division Duplexing Systems

Guimarães, Francisco Rafael Vasconcelos; Fodor, Gábor; Freitas, Walter C.; Silva, Yuri C. B.

doi:10.1109/tvt.2017.2777477

Cited by 15 publications

(4 citation statements)

References 35 publications

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“…Therefore, the four vectors r(i), t(i), f (i), and s(i), given by ( 10)-( 13), show which nodes in the network are receiving, transmitting, simultaneously receiving and transmitting, and are silent in time slot i, respectively. Due to condition (8), the elements in the vectors r(i), t(i), f (i), and s(i) are mutually dependent and have to satisfy the following condition r(i)…”

Section: Problem Formulationmentioning

confidence: 99%

Optimal Centralized Dynamic-Time-Division-Duplex

Razlighi¹,

Zlatanov²,

Pokhrel³

et al. 2021

IEEE Trans. Wireless Commun.

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The study of optimal properties of centralized dynamic-time-division-duplex (D-TDD) employed at a wireless network consisting of multiple nodes is a highly challenging and partially understood problem in the literature. In this paper, we develop an optimal centralized D-TDD scheme for a wireless network comprised of K full-duplex nodes impaired by self-interference and additive white Gaussian noise. As a special case, we also propose the optimal centralized D-TDD scheme when part or all nodes in the wireless network are half-duplex. Thereby, we derive the optimal adaptive scheduling of the reception, transmission, simultaneous reception and transmission, and silence at every node in the network in each time slot such that the rate region of the network is maximized. The performance of the optimal centralized D-TDD can serve as an upper-bound to any other TDD scheme, which is useful in qualifying the relative performance of TDD schemes. The numerical results show that the proposed centralized D-TDD scheme achieves significant rate gains over existing centralized D-TDD schemes.

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Section: Problem Formulationmentioning

confidence: 99%

Optimal Centralized Dynamic-Time-Division-Duplex

Razlighi¹,

Zlatanov²,

Pokhrel³

et al. 2021

IEEE Trans. Wireless Commun.

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“…This arrangement mitigates interference by eliminating the occurrence of crossed-slot for celledge users that have high interference. In [20], a distributed beamforming scheme is proposed that subsequently improves SINR performance. In [21], a coordinated beamforming scheme is proposed that coordinates beam scheduling based on the information exchanged between base stations (BSs).…”

Section: A Related Workmentioning

confidence: 99%

Interference Management Using Crossed-Slot in Dynamic Time Division Duplexing Systems

Kim

Cho

2019

IEEE Access

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Dynamic time division duplex is a promising 5th generation (5G) mobile communication technology that can improve spectrum efficiency by meeting the demands of asymmetric and rapidly varying uplink and downlink traffic. However, when two adjacent cells have opposite transmission directions and share a time slot, it causes serious interference called crossed-slot interference. In this paper, we show that a crossed time slot shared by two adjacent cells can improve the signal-to-interference ratio (SIR) depending on the location of the user equipment (UE). We mathematically derive a beneficial UE region and show through simulations that the opportunistic usage of crossed-slot transmissions can mitigate interference and achieve a high SIR. INDEX TERMS 5G mobile communication, crossed-slot interference, dynamic time division duplex, interference mitigation.

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“…In [20], mathematical analysis has been performed to evaluate how considering specific UE location would be beneficial for CLI between two cells. It is shown in [21] that beam scheduling can be useful for reducing the CLI. We note that all previous works require full or partial information shared among all cells for CLI control, which can be realized only in a centralized manner.…”

Section: Introductionmentioning

confidence: 99%

Decentralized Slot-Ordered Cross Link Interference Control Scheme for Dynamic Time Division Duplexing (TDD) in 5G Cellular System

Lee

Kang

2021

IEEE Access

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Dynamic time-division duplexing (TDD) allows for flexible resource allocation for the varying downlink (DL) and uplink (UL) traffic demands in the 5G cellular network. It becomes more useful when the number of active users is highly limited, especially for the small cells in a ultra-dense network. However, traffic imbalance between DL and UL in adjacent cells incurs crosslink interference (CLI), which may seriously reduce the system throughput. In order to deal with CLI induced by dynamic TDD, full or partial information on slot assignment and/or mutual interference must be shared among all cells for coordinating dynamic slot assignment throughout the system. In this paper, we propose the fully decentralized slot assignment policies that can reduce the CLI without resorting to side information shared among the cells. It is based a bi-directional slot-ordered scheduling scheme in each subframe, which exploits implicit location-dependent information such as signal-to-interference-plus-noise ratio (SINR) and/or threedimensional spatial angle for all UEs in each cell under a full-dimension multi-input and multi-output (FD-MIMO) operation. Our system-level performance evaluation in 5G system scenario has shown that the proposed approach can maintain total interference almost constant even subject to the CLI. Furthermore, it achieves the average system throughput as much as 95% and 91% of the performance that can be achieved by a centralized greedy search for DL and UL, respectively, without much compromising the lower 5% system throughput.INDEX TERMS 5G, crosslink interference (CLI), dynamic TDD, full dimension MIMO, New Radio (NR), time-division duplexing (TDD), ultra-dense network (UDN).

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Pricing-Based Distributed Beamforming for Dynamic Time Division Duplexing Systems

Cited by 15 publications

References 35 publications

Optimal Centralized Dynamic-Time-Division-Duplex

Optimal Centralized Dynamic-Time-Division-Duplex

Interference Management Using Crossed-Slot in Dynamic Time Division Duplexing Systems

Decentralized Slot-Ordered Cross Link Interference Control Scheme for Dynamic Time Division Duplexing (TDD) in 5G Cellular System

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