A comprehensive survey on scheduler for VoIP over WLAN

Nisar, Kashif; Amphawan, Angela; Hassan, Suhaidi; Sarkar, Nurul I.

doi:10.1016/j.jnca.2012.07.019

Cited by 35 publications

(21 citation statements)

References 58 publications

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“…With the tremendous growth in the Internet technology, the demand for higher bandwidth to support more applications and a larger number of subscribers is expected to continue escalating in the near future [5,6]. Therefore, enhancing the capacity of FSO is necessary for high-speed transfer of a large amount of data.…”

Section: Landscapementioning

confidence: 99%

Free-space optics mode-wavelength division multiplexing system using LG modes based on decision feedback equalization

2017

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Abstract.A free-space optics mode-wavelength division multiplexing (MWDM) system using Laguerre-Gaussian (LG) modes is designed using decision feedback equalization for controlling mode coupling and combating inter symbol interference so as to increase channel diversity. In this paper, a data rate of 24 Gbps is achieved for a FSO MWDM channel of 2.6 km in length using feedback equalization. Simulation results show significant improvement in eye diagrams and bit-error rates before and after decision feedback equalization.

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Section: Landscapementioning

confidence: 99%

Free-space optics mode-wavelength division multiplexing system using LG modes based on decision feedback equalization

2017

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“…Takes more time to route large packets. Packetizing the packets travelling to different destinations is difficult in the relay nodes Priority schedulers [33] Improves VoIP performance to some extent…”

Section: Solution Name Advantages Limitationsmentioning

confidence: 99%

Evaluation of VoIP QoS Performance in Wireless Mesh Networks

et al. 2017

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Abstract:The main focus of this research article is the evaluation of selected voice over Internet protocol (VoIP) solutions in wireless mesh network (WMN) scenarios. While WMNs have self-healing, self-forming, and dynamic topology features, they still pose challenges for the implementation of multimedia applications such as voice in various scenarios. Therefore, various solutions to make WMN more suitable for VoIP application have been proposed in the scientific literature. In this work, we have extensively explored a set of applicable scenarios by conducting experiments by means of a network simulator. The following scenarios were selected as the most representatives for performance evaluation: first responders, flooded village, remote village, and platoon deployment. Each selected scenario has been studied under six sub-scenarios corresponding to various combinations of the IEEE 802.11g, 802.11n, 802.11s, and 802.11e standards; the G.711 and G.729 codecs; and the ad hoc on demand distance vector (AODV) and hybrid wireless mesh protocol (HWMP) routing protocols. The results in terms of quality of service (measured with the mean opinion score rating scale), supported by the analysis of delay, jitter and packet loss, show that 802.11g integration with both VoIP codecs and AODV routing protocol results in better VoIP performance as compared to most other scenarios. In case of 802.11g integration with 802.11s, VoIP performance decreases as compared to the other sub-scenarios without 802.11s. The results also show that 802.11n integration with 802.11e decreases VoIP performance in larger deployments. We conclude the paper with some recommendations in terms of combinations of those standards and protocols with a view to achieve a higher quality of service for the given scenarios.

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“…Other works for packet loss differentiation have been proposed with a focus on either analyzing end-to-end delay or bit errors existing in the frame/packet, which helps in finding the changes in the transport layer protocol (Biaz & Vaidya, 1999;Cen, Cosman, & Voelker, 2003;Garcia & Brunstrom, 2002;Tobe, Tamura, Molano, Ghosh, & Tokuda, 2000). Nisar, Amphawan, Hassan, and Sarkar (2013) presented a survey which indicates the importance of scheduling techniques in Wireless LAN for real-time applications. Kohlar, Handley, and Floyed (2006) proposed a Datagram Congestion Control Protocol (DCCP) to maximize the performance of multimedia applications.…”

Section: Related Workmentioning

confidence: 99%