Ns2Voip++, an enhanced module for VoIP simulations

VoIP traffic over Mobile Ad-Hoc Networks (MANETs) faces many interacting challenges such as the mobility of the nodes that leads to continuous link breakages, the restricted bandwidth availability, the different characteristics of the existing routing protocols, the used voice codecs, the number of the mobile nodes and the background traffic. These factors introduce variability in the latency and the packet loss rate, which in turn severely affects the voice quality that is closely related to the voice codecs used by the VoIP network. This paper examines the effects of these factors to the quality of the VoIP traffic over a MANET via extensive simulations. It also presents ways to improve the performance, based either on the routing layer or on the application layer with the aggregation of multiple voice payloads to a single packet. This aggregation significantly improves the performance of the G.711 codec, while the impact to the other codecs is negligible.

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“…We have integrated the Ns2Voip++ extension [11] for the NS-2 in order to obtain more realistic, user-level VoIP traffic.…”

Section: Simulation Setupmentioning

confidence: 99%

Performance quality evaluation with VoIP traffic aggregation in Mobile Ad-Hoc Networks

Mysirlidis¹,

Galiotos

Dagiuklas

et al. 2013

2013 IEEE 14th International Symposium on "A World of Wireless, Mobile and Multimedia Networks" (WoWMoM)

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“…These E-models were implemented on top of ns2Voip++ [6], an existing VoIP extension for ns-2. ns2Voip++ is provided as a patch for ns-2, mixed with ns2measure [8], a framework for data collection and statistical analysis.…”

Section: Integrating the E-model Variants In Ns-2mentioning

confidence: 99%

On-the-fly VoIP call quality evaluation with improved E-model

Salmerón

Merino

2013

Proceedings of the 8th ACM Workshop on Performance Monitoring and Measurement of Heterogeneous Wireless and Wired Networks

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This paper presents an improvement to an existing VoIP call quality model in the context of mobile networks, that works on-the-fly and deals with uncertainty. Subjective call quality evaluation with real people is expensive and hard to setup. Network engineers would benefit from automated means to approximate these subjective measures, such as the ITU-T E-model, in the development and planning phases. We have improved this call quality model to allow on-the-fly measurement while dealing with uncertainty inherent to the model, included additional corrections, and implemented it as a ns-2 module. Accurate and on-the-fly evaluation also enables further analysis and optimization tasks, such as those performed in previous work. We compare our version against the original definition of the E-model and present further results from our simulations.

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“…Journal of Computer Networks and Communications 7 In application level, Ns2voip++ modules [15] were used to generate VoIP traffic. The VoIP source is configured to draw the duration of the talkspurt and silence periods from Weibull distribution.…”

Section: Simulation Scenario Descriptionmentioning

confidence: 99%

A New QoS Management Scheme for VoIP Application over Wireless Ad Hoc Networks

Brak

Benhaddou

2014

Journal of Computer Networks and Communications

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Nowadays, mobile ad hoc networks (MANETs) have to support new applications including VoIP (voice over IP) that impose stringent QoS (quality of service) constraints and requirements. However, VoIP applications make a very inefficient use of the MANET resources. Our work represents a first step toward improving aspects at the network layer by addressing issues from the standpoint of adaptation, claiming that effective adaptation of routing parameters can enhance VoIP quality. The most important contribution is the adaptive OLSR-VA algorithm which provides an integrated environment where VoIP activity is constantly detected and routing parameters are adapted in order to meet the application requirements. To investigate the performance advantage achieved by such algorithm, a number of realistic simulations (MANET scenarios) are performed under different conditions. The most important observation is that performance is satisfactory in terms of the perceived voice quality.

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Ns2Voip++, an enhanced module for VoIP simulations

Cited by 9 publications

References 6 publications

Performance quality evaluation with VoIP traffic aggregation in Mobile Ad-Hoc Networks

Performance quality evaluation with VoIP traffic aggregation in Mobile Ad-Hoc Networks

On-the-fly VoIP call quality evaluation with improved E-model

A New QoS Management Scheme for VoIP Application over Wireless Ad Hoc Networks

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