Impact of Propagation Environment on Energy-Efficient Relay Placement: Model and Performance Analysis

Parzysz, Fanny; Vu, Mai; Gagnon, François

doi:10.1109/twc.2014.022714.131351

Cited by 20 publications

(33 citation statements)

References 30 publications

(52 reference statements)

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“…For the channel gains, we consider the path-loss model presented in [9], which is based on the WINNER II project [11]. First, h d is modelled using scenario C2 of [11].…”

Section: B Model For Half-duplex Relaying and Channel Propagationmentioning

confidence: 99%

“…To analyze the transmit energy, we adapt the geometrical model for energy-efficient relay placement presented in [9].…”

Section: A Analysis Of the Transmit Energymentioning

confidence: 99%

“…The model is built on four characteristic distances, which are independent of the cell shape and sectorization. We briefly restate this model in the following but refer the reader to [9] for the computation of the characteristic distances.…”

Section: ) Description Of the Modelmentioning

confidence: 99%

“…Since performance highly depends on the different system and channel parameters, efficient relay deployment can be hardly estimated using some established formulas. Thus, to predict the transmit energy consumption without requiring excessive simulations, we consider the geometrical model proposed in our previous work [9], that we adapt to fit more general settings and circular cells aided by N r relays. Other geometrical patterns have been used in the literature, such as in [8,10].…”

Section: Introductionmentioning

confidence: 99%

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Trade-Offs on Energy-Efficient Relay Deployment in Cellular Networks

Parzysz

Gagnon

2014

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall)

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Relay-based cellular networks are likely to play an important role in the race for energy efficiency. However, potential gains greatly depend on how relay stations are deployed within the cell. Using a geometrical model for energy-efficient analysis, we investigate the impact of the number and location of relays on energy consumption, and its dependence on the relay coding scheme and the propagation environment, i.e. the pathloss and the line-of-sight conditions. In addition to the transmit energy, we account for the economic cost of relay deployment, as well as the overhead energy dissipated at each relay stations due to data processing and network maintenance. We then bring out four key trade-offs which balance the cost and flexibility of relay deployment, the energy efficiency and the coverage extension. I. INTRODUCTIONA major challenge for next generation cellular systems is to provide high-data-rate services in an energy-efficient manner to all users, including at cell-edge. In this regard, relaying is considered as a promising option for significant gains for both coverage extension and energy consumption. The issue of relay deployment embraces both the number of relay stations and their position within the cell.A wide literature proposes analysis and algorithms for optimal relay placement regarding coverage [1-3], outage probability [4], energy consumption [5] or spectral efficiency [6]. However, obtained results are only valid for the considered radio propagation model and coding scheme. Moreover, relay deployment is also constrained by the urban topography and by administrative by-laws, which implies that it may be impossible to locate a relay station at its optimal location. Therefore, the performance analysis of sub-optimal relay placement is relevant and the deployment flexibility should be considered as well, i.e. the possibility for a designer to have a wide range of potential relay locations without harming the network performance too much.The system performance is also greatly affected by the number of relays in the cell, as shown in [5][6][7][8]. These works converge to the existence of some threshold beyond which adding more relays does not improve the system performance significantly. With this perspective, a trade-off between capacity enhancement and deployment cost has been highlighted in [7]. Though, trade-offs between energy efficiency and relay deployment have been little explored in the literature.

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“…For the channel gains, we consider the path-loss model presented in [9], which is based on the WINNER II project [11]. First, h d is modelled using scenario C2 of [11].…”

Section: B Model For Half-duplex Relaying and Channel Propagationmentioning

confidence: 99%

“…To analyze the transmit energy, we adapt the geometrical model for energy-efficient relay placement presented in [9].…”

Section: A Analysis Of the Transmit Energymentioning

confidence: 99%

Section: ) Description Of the Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Trade-Offs on Energy-Efficient Relay Deployment in Cellular Networks

Parzysz

Gagnon

2014

2014 IEEE 80th Vehicular Technology Conference (VTC2014-Fall)

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show abstract

“…Specifically, two-hop decode-and-forward (DF) relaying protocols significantly improve the throughput/capacity [3]- [6]. However, all the above studies of the advantages of relaying are based on an ideal assumption that the transmission is errorfree or arbitrarily reliably at Shannon's channel capacity where coding is assumed to be performed in the infinite blocklength (IBL) regime (using a code block of infinite length).…”

Section: Introductionmentioning

confidence: 99%