WLC10-2: Analytic Optimization of Hybrid ARQ Performance in Wireless Packet Data Systems

Cho, Jeong-woo; Chang, Yong; Kim, Yuchul; Chon, JaeHong

doi:10.1109/glocom.2006.669

Cited by 6 publications

(7 citation statements)

References 12 publications

(15 reference statements)

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“…In fact, although these schemes have been studied mostly as techniques to increase the throughput, as for instance in [6], [7], the recent literature reports an increasing interest on their energy efficiency. Collaborative and noncollaborative HARQ systems under an outage constraint are studied in [8], where it is shown that the optimal irradiated energy depends both on the number of retransmissions and on the consumption of the electronic components of the transceivers.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Code Rate of Energy-Constrained Wireless Communications With HARQ

Rosas

Souza

Pellenz

et al. 2016

IEEE Trans. Wireless Commun.

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Retransmissions due to decoding errors have a big impact on the energy budget of low-power wireless communication devices, which can be reduced by using hybrid automatic repeat request (HARQ) techniques. Nevertheless, this reduction comes at the cost of extra energy consumption introduced by the added computational load. No complete analysis of the trade-off between retransmissions reduction and baseband consumption of low-power communications over fading channels has been reported so far.In this article, we study the energy efficiency achievable by HARQ schemes when the code rate of the error-correcting code is optimized. For this purpose, we develop an energy consumption model that focuses on simple HARQ (S-HARQ) and Chase combining (HARQ-CC) transmissions, which are studied under fast-fading and block-fading scenarios with Nakagami-m fading. The retransmission statistics are analyzed, and expressions for the expected number of transmission trials are derived. Using this framework, it is shown that transmission schemes with high diversity gain are the most efficient choice for long range transmissions, which in our case corresponds to HARQ-CC and codes with low code rate. On the other hand, schemes with good multiplexing capabilities are optimal for short link distances, which in our analysis corresponds to S-HARQ and high code rates. It is also shown that HARQ-CC can effectively extend the transmission range of a low-power communication device.

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Section: Introductionmentioning

confidence: 99%

Optimizing the Code Rate of Energy-Constrained Wireless Communications With HARQ

Rosas

Souza

Pellenz

et al. 2016

IEEE Trans. Wireless Commun.

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“…Based on that, a tractable model was proposed in [31], and extensive simulation results in [32] also support the model. Cho et al [33] slightly modified the model and concluded that the ratio of the SNR increment per retransmission to the original SNR, i.e., ∆η/η 0 , is proportional to α: ∆η = gαη 0 , where the IR coding gain g ≥ 1 is weakly dependent on the modulation and coding scheme [31], [34], [32]. We adopt this basic model.…”

Section: A Drizzlementioning

confidence: 99%

“…With respect to parameter settings in our simulations, the ARQ retransmission timeout period is set to be 0.05 milliseconds. In HARQ IR, we set the maximum number of retransmissions to be 4, and the corresponding optimal size of redundancy packets based on the results in [33]. We set the packet size as 512 bits and the block size as 8 bits.…”

Section: A Drizzlementioning

confidence: 99%

Drizzle: Cooperative Symbol-Level Network Coding in Multichannel Wireless Networks

Kim

Jin

2010

IEEE Trans. Veh. Technol.

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Errors are inherently present in unreliable wireless channels. The primary challenge in designing error control protocols in the MAC or physical layer is to effectively maximize achievable throughput in wireless networks even when unpredictable and time-varying errors exist. Network coding has been successfully applied to improve throughput in IEEE 802.11-based wireless networks with a shared broadcast channel. In state-ofthe-art physical layer designs in multi-channel wireless networks (such as IEEE 802.16 WiMAX), however, the convenience of a shared wireless broadcast channel to perform opportunistic listening no longer exists, and Hybrid ARQ (HARQ) is the predominant error control protocol in the physical layer, rather than plain ARQ in IEEE 802.11 MAC. Would network coding be well employed in multi-channel wireless networks and able to bring further improvements over HARQ? This paper proposes Drizzle, a new solution to maximize throughput with the presence of errors, that takes advantage of network coding at the symbol level in multi-channel wireless networks. By operating at the symbol level and using soft decision values, we show that Drizzle is able to exploit both time and cooperative diversity in realistic multi-channel wireless networks, to adapt to time-varying and bursty channel errors, and to efficiently collect as many correct symbols as possible at the receiver.

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“…The packet error rates in the additive white gaussian noise (AWGN) model are obtained through extensive simulations based on the technical specification document [1]. For HARQ, we only focus on Incremental Redundancy which is shown to achieve better performance than Chase Combining [14]. We set the maximum number of retransmissions to be 4, and the corresponding optimal size of redundancy packets based on the results in [14].…”

Section: Performance Evaluationmentioning

confidence: 99%

“…For HARQ, we only focus on Incremental Redundancy which is shown to achieve better performance than Chase Combining [14]. We set the maximum number of retransmissions to be 4, and the corresponding optimal size of redundancy packets based on the results in [14].…”

Section: Performance Evaluationmentioning

confidence: 99%

Is Random Network Coding Helpful in WiMAX?

Jin

Kong

2008

IEEE INFOCOM 2008 - The 27th Conference on Computer Communications

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The IEEE 802.16 standard, or WiMAX, has emerged to facilitate high-bandwidth wireless access in realworld metropolitan areas, commonly referred to as 4G. In WiMAX, Hybrid Automatic Repeat reQuest (HARQ) is adopted to transmit data packets reliably. However, it sacrifices resilience in time varying channels, and it may under-utilize the wireless medium in the cases of multi-path and multi-hop transmissions. On the other hand, random network coding has been shown to be effective towards improving throughput in multi-hop wireless networks, when deployed above the physical and MAC layers. It would be encouraging to observe that network coding is also helpful at the MAC layer in practice, especially within the emerging WiMAX standard.Is random network coding beneficial in WiMAX at the MAC layer? In this paper, we seek to answer this question by evaluating network coding in three cases: single-hop transmissions, handovers, and multi-hop transmissions. We show that random network coding has indeed offered important advantages as compared to traditional HARQ. Our observations may lead to the use of random network coding at the MAC layer in practical WiMAX systems.

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WLC10-2: Analytic Optimization of Hybrid ARQ Performance in Wireless Packet Data Systems

Cited by 6 publications

References 12 publications

Optimizing the Code Rate of Energy-Constrained Wireless Communications With HARQ

Optimizing the Code Rate of Energy-Constrained Wireless Communications With HARQ

Drizzle: Cooperative Symbol-Level Network Coding in Multichannel Wireless Networks

Is Random Network Coding Helpful in WiMAX?

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