Selective and Opportunistic AF Relaying for Cooperative ARQ: An MLSD Perspective

Tseng, Chun-Kai

doi:10.1109/tcomm.2018.2868689

Cited by 6 publications

(8 citation statements)

References 18 publications

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“…Alternatively, it is indicated by [28] that diversities in different domains (e.g., time, frequency, spatial) can play a key role in reliability enhancements. It is proved capable to significantly reduce packet errors by exploiting the multi-path spatial diversity in multi-hop networks, such as Cloud-RAN fronthauls [13], amplified-and-forward relaying networks [14], and aeronautical ad-hoc networks [15].…”

Section: Related Workmentioning

confidence: 99%

“…Differing from the physical layer approaches [9], [10], [11], our proposed data link layer method does not rely on cross-user resource allocation nor on specific multiplexing scheme. Indeed, CLARQ exploits the time diversity in an opportunistic fashion, and therefore is capable to apply in single-hop networks without making use of spatial-diversity-based methods [13], [14], [15].…”

Section: Related Workmentioning

confidence: 99%

“…Differing from such physical layer approaches, in this paper we propose a novel protocol, namely CLARQ that i) works in the finite blocklength (FBL) regime, where the resources prededicated to the DL slots can be dynamically re-allocated and exploited for retransmission in UL upon failures, ii) can automatically enable ARQ/HARQ techniques in URLLC scenarios where the E2E latency is strictly limited, iii) can significantly increase the closed-loop reliability of communication that may appear especially critical when ultra-reliable use cases are in place, and iv) exploits the time diversity in an opportunistic fashion, and therefore is capable to apply to single-hop networks without making use of spatial-diversity-based methods, (e.g. [13], [14], [15]).…”

Section: Introductionmentioning

confidence: 99%

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CLARQ: A Dynamic ARQ Solution for Ultra-high Closed-loop Reliability

Han,

Zhu,

Sun

et al. 2021

Preprint

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Emerging wireless control applications demand for extremely high closed-loop reliability under strict latency constraints, which the conventional Automatic Repeat reQuest (ARQ) solutions with static schedules fail to provide. To overcome this issue and enable data-link layer error control for ultra reliable low-latency communication (URLLC) services, we propose a novel protocol: the Closed-Loop ARQ (CLARQ), which forces to accomplish an information exchange round within a fixed loop-back latency, and dynamically re-allocates the remaining resource between uplink and downlink slots upon the result of last uplink transmission. The proposed method guarantees to meet the latency requirement, while delivering high communication reliability and power efficiency. It can be efficiently offline optimized by means of dynamic programming techniques, and is capable of real-time deployment with a low-cost implementation based on look-up tables. Numerical evaluations have verified that CLARQ outperforms baselines with significantly improved closed-loop reliability and reduced energy consumption. Especially, over a Rayleigh channel with 0 dB mean SNR, it is able to provide a closed-loop error rate below 10 −7 within 10 ms loop-back latency, which makes our proposal competitive for practical URLLC applications in future 5G-and-beyond networks.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CLARQ: A Dynamic ARQ Solution for Ultra-high Closed-loop Reliability

Han,

Zhu,

Sun

et al. 2021

Preprint

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“…In [28], with the joint optimization of transmission power and rate, authors have adopted and have compared between many packet retransmissions schemes to find out the most appropriate one that yields to the best spectrum efficiency performance over multi-hop relay networks. In [29], [30], new types of ARQ based on a selective and opportunistic AF relaying method have been developed. Through simulations, authors showed that the proposed ARQ schemes are more effective for throughput enhancements, and can provide cell-edge users almost three times the throughput gain in comparison with ARQ with no relay-assisted forwarding.…”

Section: Introductionmentioning

confidence: 99%

HARQ in Full-Duplex Relay-Assisted Transmissions for URLLC

Airod

Chafnaji

Yanıkömeroğlu

2021

IEEE Open J. Commun. Soc.

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The Release 16 completion unlocks the road to an exciting phase pertain to the sixth generation (6G) era. Meanwhile, to sustain far-reaching applications with unprecedented challenges in terms of latency and reliability, much interest is already getting intensified toward physical layer specifications of 6G. In support of this vision, this work exhibits the forward-looking perception of full-duplex (FD) cooperative relaying in support of upcoming generations and adopts as a mean concern the critical contribution of hybrid automatic repeat request (HARQ) mechanism to ultra-reliable and low-latency communication (URLLC). Indeed, the HARQ roundtrip time (RTT) is known to include basic physical delays that may cause the HARQ abandonment for the 1 ms latency use case of URLLC. Taking up these challenges, this article proposes a hybrid FD amplify-and-forward (AF)-selective decode-and-forward (SDF) relay-based system for URLLC. Over this build system, two HARQ procedures within which the HARQ RTT is shortened, are suggested to face latency and reliability issues, namely, the proposed and the enhanced HARQ procedures. We develop then an analytical framework of this relay based HARQ system within its different procedures. Finally, using Monte-Carlo simulations, we confirm the theoretical results and compare the proposed relay-assisted HARQ procedures to the source-to-destination (S2D) HARQ-based system where no relay assists the communication between the source and the destination.

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“…In order to ensure the reliable transmission of highspeed data, the system includes effective error detection and retransmission technology. The HARQ (hybrid automatic repeat request) strategy consists of two parts: (1) error detection, the receiving port will receive the data error detection, if the data is wrong, start retransmission and (2) retransmission, using the reverse link to request the source side to send again [11,12]. In reference [13], the influence of low-power transmission strategy and incomplete channel state information on outage probability of HARQ-assisted nonorthogonal multiple access systems was obtained by using integral domain partition method and extended to the scenarios with any number of users.…”

Section: Introductionmentioning

confidence: 99%

Tradeoff‐HARQ Scheme for Full‐Duplex SWIPT DF Relay

Shi

Zhu

Ding

et al. 2021

Wireless Communications and Mobile Computing

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The SWIPT (simultaneous wireless information and power transfer) DF (decoding and forwarding) relay system could achieve the purpose of both increasing revenue and reducing expenditure. By analysing the system model and transmission characteristics of full-duplex relay, this paper optimizes the retransmission slot structure to enhance the system performance. Firstly, the state transition model is established based on the analysis of the retransmission slot structure. Secondly, the state probability of each state and the transition probability between states are calculated to obtain the total data passing rate, energy transmission efficiency, and total transmission time. Thirdly, in order to compare the performance of various HARQ (hybrid automatic repeat request) schemes more effectively, JNTP (joint normalized throughput of information transmission and energy transmission) is constructed. Monte Carlo simulations finally confirm that the proposed tradeoff-HARQ scheme outperforms the regular-HARQ scheme in terms of JNTP: the performance of the tradeoff-HARQ scheme is 0.03883 higher than that of the regular-HARQ scheme when the total power limit is 20 dB and 0.00651 higher than that of the regular-HARQ scheme when the total power limit is 30 dB.

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Selective and Opportunistic AF Relaying for Cooperative ARQ: An MLSD Perspective

Cited by 6 publications

References 18 publications

CLARQ: A Dynamic ARQ Solution for Ultra-high Closed-loop Reliability

CLARQ: A Dynamic ARQ Solution for Ultra-high Closed-loop Reliability

HARQ in Full-Duplex Relay-Assisted Transmissions for URLLC

Tradeoff‐HARQ Scheme for Full‐Duplex SWIPT DF Relay

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