Energy efficiency analysis in relay assisted hybrid-ARQ communications

Maaz, Mohamad; Mary, Philippe; Hélard, Maryline

doi:10.1109/pimrc.2012.6362732

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Pr [τ k1,k2 ], (18) where · is the rounding function (rounding to the next highest integer). In fact, (18) shows the outage probability of C-ARQ protocols with limited number of retransmissions (also known as the truncated retransmission).…”

Section: B Distribution Of τ and Outage Probability Of C-arqmentioning

confidence: 99%

“…In fact, (18) shows the outage probability of C-ARQ protocols with limited number of retransmissions (also known as the truncated retransmission). We do not focus on the truncation of C-ARQ protocols in this work.…”

Section: B Distribution Of τ and Outage Probability Of C-arqmentioning

confidence: 99%

“…For instance, from a pure physical-layer perspective [16] shows that C-ARQ has higher energy efficiency than the noncooperative ARQ schemes under certain channel conditions. In addition, [17], [18] show that the energy efficiency of C-ARQ has a strong dependence on the number of retransmissions. Apart from the additional energy consumption, C-ARQ protocols also lead to a more complex framing-structure which likely introduces additional stochastic delays to the information flow from the source to the destination.…”

Section: Introductionmentioning

confidence: 99%

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QoS-Constrained Energy Efficiency of Cooperative ARQ in Multiple DF Relay Systems

Gross

Schmeink

2016

IEEE Trans. Veh. Technol.

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PostprintThis is the accepted version of a paper published in IEEE Transactions on Vehicular Technology. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. Citation for the original published paper (version of record):Hu, Y., Gross, J., Schmeink, A. (2015) QoS-Constrained Energy Efficiency of Cooperative ARQ in Multiple DF Relay Systems. IEEE Transactions on Vehicular TechnologyAccess to the published version may require subscription. N.B. When citing this work, cite the original published paper. Abstract-In this paper, we study the higher-layer performance as well as the "throughput, delay, energy consumption" tradeoff problem for multi-relay assisted cooperative automatic repeat request (C-ARQ) protocols. We study a practical scenario where only the average channel state information is available at the source and relays. We consider four multi-relay C-ARQ protocols, and derive closed-form expressions for the transmission delay distribution, the energy consumption and the higherlayer queuing performance. Furthermore, we analyze the QoSconstrained energy efficiency performances of the protocols. Our analysis is validated by simulations. In addition, we evaluate the system performance under these C-ARQ protocols and for different topologies. We conclude several guidelines for the design of efficient C-ARQ protocols. Finally, a simple extension of the studied C-ARQ protocols is proposed, which improves the QoSconstrained energy efficiency by 4%. Permanent link to this version

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Section: B Distribution Of τ and Outage Probability Of C-arqmentioning

confidence: 99%

Section: B Distribution Of τ and Outage Probability Of C-arqmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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QoS-Constrained Energy Efficiency of Cooperative ARQ in Multiple DF Relay Systems

Gross

Schmeink

2016

IEEE Trans. Veh. Technol.

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“…In our previous works [15], [16], EE in relay-assisted HARQ scheme have been analyzed in a single user context without considering any resource optimization problem. In particular in [16], we have been interested in the EE analysis for HARQ schemes in single user source-relay-destination framework, when a practical FPGA target is considered.…”

Section: Introductionmentioning

confidence: 99%

Energy Minimization in HARQ-I Relay-Assisted Networks With Delay-Limited Users

Maaz

Mary

Hélard

2017

IEEE Trans. Veh. Technol.

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This paper investigates a practical energy minimization problem for multiuser relay-assisted downlink cellular networks. The system adopts an hybrid-automatic-repeat-request of type I (HARQ-I) protocol and each user has an average delay constraint to be satisfied under a total power constraint for the system. The contribution of this paper lies in several folds: i) By introducing new constraints and new variables in the original problem, the solution is analytically obtained by the dual method. ii) An algorithm that jointly allocates for every user the optimal downlink power at base station (BS) and relay station (RS) and selects the RS (if cooperation is decided) is proposed. iii) Another binary integer programming algorithm that selects the optimal modulation and coding scheme (MCS) and optimizes the number of time-frequency resource blocks (RBs) between users is proposed. In order to corroborate our findings, simulation results in terms of energy-delay tradeoff, average starvation user rates and selected MCS statistics are presented. Our analyses show that relay-assisted strategy improves up to 30 % the energy consumption compared to non-relay-assisted one.

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“…The error rate, delay, and EE for cooperative the HARQ-Chase combining (CC) protocol have been studied in [25]. In [26], the authors have shown that when considering the circuitry energy consumption, relaying deployments are not always energy efficient.…”

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confidence: 99%

Energy efficiency analysis of hybrid-ARQ relay-assisted schemes in LTE-based systems

Maaz¹,

Lorandel²,

Mary³

et al. 2016

J Wireless Com Network

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This work deals with the analysis of energy efficiency (EE) issues of hybrid automatic repeat request (HARQ) protocols such as Chase combining (CC) and incremental redundancy (IR), in a LTE baseband-based half-division duplex relay-assisted network. The EE performance is highly dependent on delay and circuitry power consumption, i.e., baseband and radio-frequency (RF) parts, and the effects of these components are investigated for amplify and forward (AF) and decode and forward (DF) protocols. Moreover, a realistic estimation of the baseband power consumption is provided. Our contributions in this paper can be summarized as follows: (1) an accurate estimation of power consumption of the main blocks of the LTE baseband is provided based on a real field-programmable gate array (FPGA) target and is integrated to a global energy consumption model (2) based on the previous power consumption evaluation; energy-efficiencies of DF protocol with HARQ-CC and HARQ-IR are investigated with various modulation orders; in addition, a quite insightful study of the energy efficiency-spectral efficiency trade-off is conducted, and (3) DF and AF protocols with HARQ are compared in terms of EE, and recommendations are suggested in order to jointly enhance the QoS and the energy efficiency of wireless systems.

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Energy efficiency analysis in relay assisted hybrid-ARQ communications

Abstract: Introduction 2 Motivations and system model 3 Related works and contributions 4 Theoretical energy efficiency in relay assisted network 5 Simulation results 6 Conclusions and future works M. Maaz Cooperative communications 2 / 15

Cited by 7 publications

References 12 publications

QoS-Constrained Energy Efficiency of Cooperative ARQ in Multiple DF Relay Systems

QoS-Constrained Energy Efficiency of Cooperative ARQ in Multiple DF Relay Systems

Energy Minimization in HARQ-I Relay-Assisted Networks With Delay-Limited Users

Energy efficiency analysis of hybrid-ARQ relay-assisted schemes in LTE-based systems

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