Cross-layer opportunistic adaptation for voice over ad hoc networks

Obeidat, Suhaib; Aldaco, Abraham N.; Syrotiuk, Violet R.

doi:10.1016/j.comnet.2011.11.002

Cited by 4 publications

(5 citation statements)

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“…The link and codec adaptation mechanisms [4,5] were one step ahead to construct QoS solution for VoIP over multirate wireless link. These mechanisms are providing resilience and robustness in cellular networks [6].…”

Section: State Of the Artmentioning

confidence: 99%

“…Well-known examples of adaptation mechanism for VoIP over wireless media are PHY/Channel adaptation which allows each mobile node to adapt its transmission rate dynamically to channel condition [7] (Figure 1(a)) and APP/MAC adaptation which adapts the codecs of the active voice flows to the new network conditions (data rate) ( Figure 1(b)). The last one is considered one of the most effective solutions of the multirate problem on VoIP calls [4,5].…”

Section: State Of the Artmentioning

confidence: 99%

“…According to [13], the routing protocol is unable to forward packets to their destinations if the NRTE is greater than Input: node , number of dropping packet cause of no available route reason NRTE . Output: default parameters values (1) Begin (2) if LVA = true or NVA = true then (3) for = to (5) 4Calculate AVG(NRTE ) (5) End for (6) While AVG(NRTE ) > 10% do (7) ← defout values (8) ← defout values (9) End while (10) End if (11) End Algorithm 2: OLSR-VA Default adaptation function( , NRTE ). a defined threshold.…”

Section: (I) Monitoring Local Voip Activity-(lva-) Adaptationmentioning

confidence: 99%

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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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Section: State Of the Artmentioning

confidence: 99%

Section: State Of the Artmentioning

confidence: 99%

Section: (I) Monitoring Local Voip Activity-(lva-) Adaptationmentioning

confidence: 99%

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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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“…Research on CLD optimization in WLANs has recently attracted significant interest in the wider networking research community (Athanasiou, Korakis, Ercetin, & Tassiulas, 2009;Caillouet, Pérennes, & Rivano, 2011;Khan, Mahmud, Loo, & Al-Raweshidy, 2008;Obeidat et al, 2012). This research is concerned with sharing information between various protocol layers, as specified in the ISO/OSI reference model (OSI Reference Model).…”

Section: A Review Of Literaturementioning

confidence: 99%

“…radio channel) operation was considered separately from data link layer communication. However, in recent times it has become recognized that performance gains can be achieved by adjusting data link layer protocols to suit the changing conditions of the PHY layer (Chen, Low, & Doyle, 2011;Dong, 2012;Obeidat, Aldaco, & Syrotiuk, 2012;Pudasaini & Shin, 2012). This is an area of great international interest because network engineers are challenged continually to extract Design and Evaluation of a Cross-Layer Framework for Improving 802.11 Networks:…”

Section: Introductionmentioning

confidence: 99%

Design and Evaluation of a Cross-Layer Framework for Improving 802.11 Networks

Sarkar

2013

International Journal of Business Data Communications and Networking

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This paper reports on the design and evaluation of a class of cross-layer design (CLD) framework for improving the performance of 802.11-based wireless local area networks (WLANs). While various CLD approaches have been proposed for improving the performance of WLANs in recent years, the problem of efficient channel utilization, higher throughput, lower packet delay, and fairness has not been fully solved yet. To overcome the performance problems of 802.11, we propose a CLD framework which is based on a cross-layer medium access control (MAC) protocol called the channel-aware buffer unit multiple access (C-BUMA). In the framework, the radio propagation (i.e. physical layer) is combined with the MAC sub-layer to develop a robust cross-layer communication. By sharing channel information with the MAC protocol, the approach reduced unnecessary packet transmissions, and hence reduced bandwidth wastage and significantly improved the system performance. The proposed CLD method is evaluated by extensive simulation experiments. A comparison with 802.11 standards is provided. Results obtained show that the network achieves up to 13.5% higher throughput, 56% lower packet delay, 40% better fairness, and 38% lower packet dropping with the proposed CLD. We also found that the proposed CLD outperforms Pham’s CLD with respect to network throughput and packet dropping. The analysis and empirical results reported in this paper provide some insights into the design and evaluation of a CLD framework for improving data rate of 802.11 networks which may help researchers in this field to overcome the remaining design issues and challenges.

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