Capacity evaluation of VoIP in IEEE 802.11e WLAN environment

Trad, Abdelbasset; Munir, Farukh; Afifi, Hossam

doi:10.1109/ccnc.2006.1593155

Cited by 15 publications

(21 citation statements)

References 5 publications

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“…The VoIP QoS in WMN partly also depends on the types of voice codec used [6], [7]. The primary function of a voice codec is to perform analog/digital voice signal conversion and digital compression.…”

Section: R R R R Mosmentioning

confidence: 99%

“…The encoded data is packetized and transmitted using RTP/UDP/IP [7]. At the receiver's side, data is de-packetized and forwarded to a jitter buffer, which smoothes out the delay incurred in the network.…”

Section: Voip Basicsmentioning

confidence: 99%

“…The quality of a VoIP call [10] is impacted by several parameters such as delay, delay jitter, packet loss and so on. These parameters are determined by the performance of codecs, echo control, buffering and type of network [6], [7].…”

Section: Voice Quality Metrics In Wireless Mesh Networkmentioning

confidence: 99%

“…There are several VoIP call signaling protocols [7] like H.323, SIP, MGCP, and megaco/H.248, which can be used for establishment and management of VoIP traffic in WMN. The signaling refers to establishing a connection or an association between a pair of participants in VoIP call.…”

Section: Call Signaling Protocolsmentioning

confidence: 99%

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Performance Evaluation and Delay Modelling of VoIP Traffic over 802.11 Wireless Mesh Network

Chhabra¹,

Singh²

2011

IJCA

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This paper analyzes voice quality in terms of R-Factor and MOS in IEEE 802.11s Wireless Mesh Network (WMN). Another issue addressed in this paper is the effect of increasing nodes on voice transmission in wireless mesh network. The simulation model developed allows identifying the main reasons for voice quality degradation in Mesh network. Results show that voice quality measured in terms of R-Factor and MOS degrades with increase in number of hops (Wireless Mesh Points) in Wireless Mesh network. Wireless mesh network has been modeled using M/D/1 queue and based on this analytical delay model, the average one way delay suffered by Voice over IP (VoIP) traffic has been calculated. Simulations have been conducted to validate the correctness of the analytical model.

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Section: R R R R Mosmentioning

confidence: 99%

Section: Voip Basicsmentioning

confidence: 99%

Section: Voice Quality Metrics In Wireless Mesh Networkmentioning

confidence: 99%

Section: Call Signaling Protocolsmentioning

confidence: 99%

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Performance Evaluation and Delay Modelling of VoIP Traffic over 802.11 Wireless Mesh Network

Chhabra¹,

Singh²

2011

IJCA

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“…Research efforts to support quality in VoWiFi have been focused on two main approaches: (a) dimensioning works aimed at finding the maximum number of simultaneous VoIP flows that IEEE 802.11 networks can accommodate while satisfying QoS constraints (e.g. network delay, packet loss ratio) [5], [6], [7], [8], [1], [2]; and (b) link-layer proposals aimed at meeting QoS constraints in the IEEE 802.11 network by finding optimum values for MAC-layer variables such as contention window size, maximum retry limits, etc. [9], [10], [11], [12].…”

Section: Introductionmentioning

confidence: 99%

Improving the energy efficiency of VoIP applications in IEEE 802.11 networks through control of the packetization rate

Estepa

Madinabeitia

et al. 2017

Proceedings XIII Jornadas De Ingenieria Telematica - JITEL2017

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Abstract-This paper presents an adaptive algorithm that improves the energy efficiency of VoIP applications over IEEE 802.11 networks. The algorithm seeks to achieve the largest energy savings subject to reaching a minimum speech quality under the prevailing network conditions. The control mechanism used is the dynamic selection of the packet size during the communication.This algorithm has been implemented in an experimental testbed and the results demonstrate that our packetization period control algorithm can provide energy savings in uncongested IEEE 802.11 networks (up to 30%). Furthermore, under poor network conditions the algorithm can prolong the duration of the call before it is dropped at the expense of a higher energy consumption.Palabras Clave-Energy efficiency, VoIP, IEEE 802.11 jitel, telemática

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Improving Channel Scanning Procedures for WLAN Handoffs

Tsao

Cheng

Emerging Directions in Embedded and Ubiquitous Computing

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WLAN has been widely deployed over public and private areas and has become one of popular access technologies for mobile Internet services in recent several years. Handoff between WLAN access points (APs) that introduce packet loss and delay is one of the critical issues for mobile Internet applications, especially for real-time communications. Previous studies indicated that channel scanning time contributes a significant portion of handoff latency and introduces packet loss and delay. Therefore, solutions based on active scan were proposed to reduce total scanning time of channels so that the service disruption of a communication can be minimized. The other solutions based on passive scan scattering scans between packets did not optimize the total scanning time but avoid packet loss and delay. However, solutions for channel scanning procedures which combine active and passive scan strategies and take total scan latency, packet loss, and delay together into consideration have not yet been investigated. In this paper, a generic channel scanning model is proposed and solutions to improve scanning procedures for WLAN handoff are presented. Simulation results demonstrate that the proposed approaches achieve faster scan time than the existing solutions without violating packet delay and loss requirements specified by the applications during WLAN handoff. Moreover, the implementation of the proposed mechanisms on a WLAN SoC (System-on-Chip) is also discussed in this paper.

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Capacity evaluation of VoIP in IEEE 802.11e WLAN environment

Abstract: Abstract-

Cited by 15 publications

References 5 publications

Performance Evaluation and Delay Modelling of VoIP Traffic over 802.11 Wireless Mesh Network

Performance Evaluation and Delay Modelling of VoIP Traffic over 802.11 Wireless Mesh Network

Improving the energy efficiency of VoIP applications in IEEE 802.11 networks through control of the packetization rate

Improving Channel Scanning Procedures for WLAN Handoffs

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