On Enhancing WiMAX Hybrid ARQ: A Multiple-Copy Approach

Moh, Melody; Moh, Teng-Sheng; Shih, Yucheng

doi:10.1109/ccnc08.2007.210

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…Subsequent failures and retransmissions show up as delay variations multiple of the 10ms base value ( figure 3). This is consistent with the plots presented in [13], where the authors comparatively analyzed the original WiMAX HARQ scheme and their improved version. The average values of waiting time (the duration from the time the first copy of a data burst is received by the SS until the correct data burst is sent, in sequence, to the upper layer) found by the authors are always multiples of 10ms.…”

Section: Wimax 80216supporting

confidence: 73%

Measurement-based analysis of the performance of several wireless technologies

Cosma

Cabellos‐Aparicio

Domenech-Benlloch

et al. 2008

2008 16th IEEE Workshop on Local and Metropolitan Area Networks

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Abstract-Wireless technologies have rapidly evolved and are becoming ubiquitous. An increasing number of users attach to the Internet using these technologies; hence the performance of these wireless access links is a key point when considering the performance of the whole Internet. In this paper we present a measurement-based analysis of the performance of an IEEE 802.16 (WiMAX) client and an UMTS client. The measurements were carried out in a controlled laboratory. The wireless access links were loaded with traffic from a multi-point videoconferencing application and we measured three layer-3 metrics (One-Way-Delay, IP-Delay-Variation and Packet Loss Ratio). Additionally we estimate the performance of a WiFi and Ethernet client as a reference. Our results show that Ethernet and WiFi have comparable performances. Both the WiMAX and the UMTS links exhibited an asymmetric behavior, with the uplink showing an inferior performance. We also assessed the causes of the discretization which appears in the jitter distributions of these links.

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Section: Wimax 80216supporting

confidence: 73%

Measurement-based analysis of the performance of several wireless technologies

Cosma

Cabellos‐Aparicio

Domenech-Benlloch

et al. 2008

2008 16th IEEE Workshop on Local and Metropolitan Area Networks

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“…In the simulation results, some initial values were set, whereby the normalized SINR for QPSK 1/2 is used as initial value for SINR, R = 1 (no repetition), and the initial transmission power for MS and RS is assumed as the transmit power per subcarrier used during the latest initial ranging code transmission [7]. The default normalized SINR values per modulation are given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

“…Although the same packet is delivered in retransmission, the maximum ratio combination still results in some gain. And combination with just the same codes is called chase combining [7]. The type Ill HARQ introduces the idea of incremental redundancy based on type II HARQ thus obtains 0140-3664/$ -see front matter Ó 2008 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 99%

Dynamic hybrid automatic repeat request (DHARQ) for WiMAX – Mobile multihop relay using adaptive power control

Saeed¹,

Mohamad²,

Ali³

2009

Computer Communications

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“…Hybrid ARQ is used in high-quality multimedia applications [4] and can be included, as an optional extension, to improve the performance of the IEEE 802.16 standard [5]. Recent studies on this subject have analyzed ARQ schemes in detail [6], [7]. Another important field of application where investigations of ARQ techniques can be found is that of underwater acoustic communication [8], [9].…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Feedback Errors in Markov Models for SR ARQ Packet Delays

Badia

2009

GLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference

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Modern communication systems require effective error control techniques for wireless links. This problem is still relevant in many applications involving recently developed IEEE standards such as 802.16, or sensors for environmental monitoring in extreme conditions. A notable example is also underwater communication with acoustic transmission, where long delays may be present. Usually, such studies assume the availability of an error-free feedback channels which is used to perform retransmission requests in an ARQ fashion. This paper discusses the performance of the Selective Repeat ARQ scheme in terms of packet delay when the feedback that is sent back at the transmitter's side can be erroneous. A non instantaneous noisy feedback and a Bernoulli arrival process, for different traffic intensities, are considered. The system is modeled through Discrete Time Markov Chains, including the channel and the ARQ state. The system equations are derived and solved, and the impact of erroneous feedback is quantified. With respect to other similar contributions, the proposed approach presents the advantage of being directly implementable in any analysis using Markov chains to evaluate the system properties, instead of dedicated models. It can therefore be extended to a plethora of different scenarios, including different channel models and also including FEC features so as to obtain a Hybrid ARQ scheme.Index Terms-Queueing analysis, automatic repeat request, Markov processes, error analysis.

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On Enhancing WiMAX Hybrid ARQ: A Multiple-Copy Approach

Cited by 13 publications

References 8 publications

Measurement-based analysis of the performance of several wireless technologies

Measurement-based analysis of the performance of several wireless technologies

Dynamic hybrid automatic repeat request (DHARQ) for WiMAX – Mobile multihop relay using adaptive power control

On the Effect of Feedback Errors in Markov Models for SR ARQ Packet Delays

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