VoIP over DVB-RCS satellite systems: Trial results and the impact of adaptive speech coding using cross-layer design

Kalama, M.; Açar, Güray; Evans, B.G.; Isoard, Ariane

doi:10.1016/j.comnet.2008.04.011

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…On the other hand, some adaptive mechanisms monitor parameters at the MAC layer, such as transmission rate, in order to control the sending bitrate [Alshakhsi and Hasbullah 2011;Bilbao et al 2009;Kalama et al 2008;Kawata and Yamada 2006;Ksentini 2009;Servetti and Martin 2003;Sfairopoulou et al 2007;Tüysüz and Mantar 2010]. This can be performed by the sender alone without consulting the receiver, which allows for a faster reaction time against quality degradation.…”

Section: Estimation Proceduresmentioning

confidence: 98%

“…Such a cross-layer approach may also use RTCP RR reports for providing a refined adaptation [Alshakhsi and Hasbullah 2011;Sfairopoulou et al 2007;Tüysüz and Mantar 2010]. However, in satellite systems, because of the large end-to-end delay, the use of RTCP RR reports by the adaptation mechanism is not feasible [Kalama et al 2008].…”

Section: Estimation Proceduresmentioning

confidence: 99%

“…In the VoIP context, information from other layers can be used for this purpose, such as MAC layer parameters [Kalama et al 2008;Lee and Pan 2008;Servetti and Martin 2003], network throughput [Beritelli et al 2003], network delay [Rabassa et al 2010;Seo et al 2001], packet loss [Yuhe and Jie 2009;Zhang et al 2008], transport delay at the UMTS Terrestrial Radio Access Network (UTRAN) [Bilbao et al 2009], or MOS [Huang et al 2005;Jammeh et al 2010;Matta et al 2003;Qiao et al 2004;Zhou et al 2010]. …”

Section: Vbr Codecsmentioning

confidence: 99%

See 2 more Smart Citations

Survey on application-layer mechanisms for speech quality adaptation in VoIP

Carvalho

Mota

2013

ACM Comput. Surv.

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VoIP calls are sensitive to several impairments, such as delay and packet loss. One way to overcome these problems is by adaptively adjusting application-layer parameters to keep a minimum speech quality level. At the heart of self-adaptive systems lies a feedback loop, which consists of four key activities: monitoring, analysis, planning, and execution. Nevertheless, the existing adaptive approaches to QoS control of VoIP do not explicitly exhibit this feedback loop. Bringing it to surface can help developers in designing more robust and human-independent VoIP systems. This survey presents a comprehensive review of the current state-of-the-art research on speech quality adaptation of VoIP systems at the application layer and some research challenges on this subject.

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Section: Estimation Proceduresmentioning

confidence: 98%

Section: Estimation Proceduresmentioning

confidence: 99%

Section: Vbr Codecsmentioning

confidence: 99%

See 1 more Smart Citation

Survey on application-layer mechanisms for speech quality adaptation in VoIP

Carvalho

Mota

2013

ACM Comput. Surv.

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VoIP: A comprehensive survey on a promising technology

2009

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Improving QoS of VoWLAN via Cross-Layer-Based Adaptive Approach

Alshakhsi

Hasbullah

2011

2011 International Conference on Information Science and Applications

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The next generation technology of Voice over Internet Protocol (VoIP) allows voice to be delivered over the Internet Protocol based networks. The integration of VoIP and Wireless Local Area Network (WLAN) has become popular. However, WLAN architecture was primarily designed to carry data and not for real-time applications, such as VoIP. Hence, there is a need to enhance the quality of VoIP transmission over the WLAN. On the other hand, IEEE 802.11 standard of WLAN provides support to link adaptive (LA) technique. LA leads to multi-rate transmissions, which causes degradation on voice quality. In this paper, cross-layer based adaptive approach is proposed to improve the quality of voice delivery over WLAN by minimizing the multi-rate effects on the quality of service (QoS) of VoIP. The approach in achieving this is by introducing a communication agent between MAC sub-layer and Application layer, by which congestion caused by the multi-rate could be reduced, if not eliminated. Moreover, Encoder adaptation is utilized at the Application layer as codec parameters are adapted according to the change of rate occurs at the MAC sub-layer. Simulation of different scenarios for different codec rates at different transmission rates has been implemented using OPNET. The result of QoS improvements is the evidence for the proposed cross-layer adaptation approach.

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VoIP over DVB-RCS satellite systems: Trial results and the impact of adaptive speech coding using cross-layer design

Cited by 4 publications

References 18 publications

Survey on application-layer mechanisms for speech quality adaptation in VoIP

Survey on application-layer mechanisms for speech quality adaptation in VoIP

VoIP: A comprehensive survey on a promising technology

Improving QoS of VoWLAN via Cross-Layer-Based Adaptive Approach

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