Performance Evaluation of VOIP in MultiHop Wireless Mesh Network (original) (raw)
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Evaluation of VoIP QoS Performance in Wireless Mesh Networks
Information, 2017
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.
An analysis of voice over Internet Protocol in wireless mesh networks
This thesis presents an analysis of the impact of node mobility on the quality of service for voice over Internet Protocol in wireless mesh networks. Voice traffic was simulated on such a mesh network to analyze the following performance metrics: delay, jitter, packet loss and throughput. Wireless mesh networks present interesting characteristics such as multi-hop routing, node mobility, and variable coverage that can impact on quality of service. A reasonable deployment scenario for a small organizational network, for either urban or rural deployment, is considered with three wireless mesh network scenarios, each with 26 mesh nodes. In the first scenario, all mesh nodes are stationary. In the second scenario, 10 nodes are mobile and 16 nodes are stationary. Finally, in the third scenario, all mesh nodes are mobile. The mesh nodes are simulated to move at a walking speed of 1.3m per second. The results show that node mobility can increase packet loss, delay, and jitter. However, the results also show that wireless mesh networks can provide acceptable quality of service, providing that there is little or no background traffic generated by other applications. In particular, the results demonstrate that jitter across all scenarios remains within humanacceptable tolerances. It is therefore recommended that voice over Internet Protocol implementations on wireless mesh networks with background traffic be supported by quality of service standards; otherwise they can lead to service delivery failures. On the other hand, voice-only mesh networks, even with mobile nodes, offer an attractive alternative voice over Internet Protocol platform.
Pursuing Credibility in Performance Evaluation of VoIP Over Wireless Mesh Networks
intechopen.com
"There has been an increasingly interest in real-time multimedia services over wireless networks in the last few years, for the most part due to the proliferation of powerful mobile. Due to the dynamics of WMNs, there are significant challenges in the design and optimization of such services. Impairments like packet loss, delay and jitter affects the end-to-end speech quality. Experimenters have been proposing solutions to the challenges found so far, and comparing them before implementation is a mandatory task. There exists a necessity of designing efficient tools for enhancing the computational effort of the performance modeling and analysis of VoIP over WMNs. Stochastic simulation is a flexible, yet powerful tool for scientifically getting insight into the characteristics of a system being investigated. However, to ensure reproducible results, stochastic simulation imposes its own set of rules. The credibility of a performance evaluation study is greatly affected by the problem formulation, model validation, experimental design, and proper analysis of simulation outcomes. Therefore, a fine-tuning of the parameters within a simulator is indispensable, so that it closely tracks the behavior of a real network."
IST Transactions of Electrical and Electronic Systems‐Theory and Applications, Vol. 1, No. 1 (2), ISSN 1913‐8289 pp.28‐36, 2012
As Voice over IP (VoIP) becomes a reality, service providers will be able to offer the service to remote, over and under populated areas that currently are not or are only partially reached by available Public Switched Telephone Network (PSTN). The combination of wireless mesh networks (WMNs) with VoIP is an attractive solution for enterprise infrastructures, presenting availability and reduced cost for both consumers and service providers. The large number of clients in WMNs leads to an increased number of concurrent flows. However, only a handful of these flows reach their destination while still within the quality of service (QoS) bound for VoIP. This performance degradation can be attributed to protocol overhead, packet collision and interferences. This paper introduces VoIP over WMNs and uses a link-based packet aggregation scheme to improve VoIP performance in IEEE 802.11 based WMNs operating under distributed coordinate function (DCF). Simulation results show that the proposed aggregation scheme increases the number of supported flows while also reducing end-to-end delay, jitter, and packet loss of VoIP in WMNs.
Performance study of Voice in Wireless Mesh Network
2013
The wireless meshed technology is one of the most advanced technology and can be viewed as the technology of the future. This article deals with aspects like performance metrics i.e. delay, R-Factor and Mean Opinion Score (MOS) that have a direct influence on the performance of the wireless mesh network. In this paper voice quality is analyzed in terms of R-Factor and MOS in Wireless Mesh Network by performing simulations using Qualnet. Another issue addressed in this paper is the effect of increasing mesh points on voice transmission in wireless mesh network. The results show that the voice quality matrices R-Factor and MOS degrades and the average delay increases, with increase in number of hops in the Wireless Mesh network. KeywordsWMNs, MOS, Service time, Mesh Point, Average delay.
Performance of VoIP in a 802.11 wireless mesh network
2006
Performance in multihop wireless networks is known to degrade with the number of hops for both TCP and UDP traffic. For VoIP, the wireless network presents additional challenges as the perceived quality is dependent on both loss and delay. We investigate several methods to improve voice quality and present experimental results from an 802.11b testbed optimized for voice delivery. Use of multiple interfaces, path diversity and aggregation are shown to provide a combined improvement of 13 times in number of calls supported in our 15 node 802.11 mesh system.
Performance Optimizations for Deploying VoIP Services in Mesh Networks
IEEE Journal on Selected Areas in Communications, 2000
In the recent past, there has been a tremendous increase in the popularity of VoIP services as a result of huge growth in broadband access. The same VoIP service poses new challenges when deployed over a wireless mesh network while enabling users to make voice calls using WiFi phones. Packet losses and delay due to interference in a multiple hop mesh network with limited capacity can significantly degrade the end-to-end VoIP call quality.
An Algorithm to Optimize Concurrent VoIP Calls Across Wireless Mesh Networks
Journal of Advances in Information Technology
This study focused on improving the performance of Voice over Internet Protocol (VoIP) over Wireless Mesh Networks (WMN) in an 802.11ac scenario simultaneously using packet compression and packet aggregation. The study employed design science research methodology and developed an algorithm that aims to increase the number of concurrent calls while reducing the impact of jitter, delay, and packet drop. The study is the first of its kind to come up with a combined packet compression and packet aggregation technique for Voice over Internet Protocol Wireless Mesh Networks (VoWMN) in an 802.11ac setting. During simulation tests carried out using ns-3, the algorithm outperformed existing schemes in terms of average delay, jitter, packet loss, and network throughput. The algorithm performed better by 1.4% over compressed packets and by 27.22% over plain VoIP packets in terms of packet loss, and obtained the highest network throughput of 0.16Mbps which was 56.25% more than compressed packets which had the next best throughput. These findings suggest that the proposed algorithm can significantly enhance the performance of VoIP over WMN in an 802.11ac scenario. However, this study did not cover aspects related to security implications when utilizing both aggregation and compression at the same time in VoIP over WMNs. Additionally, it only focused on the 802.11ac scenario. Further research could explore the effectiveness of the proposed algorithm in other scenarios and protocols, and identify the optimal settings for the algorithm. Additional research could explore the use of other techniques, such as error correction and QoS mechanisms, to improve the performance of VoIP over WMN.
Performance analysis of VoIP in Multi-hop Wireless Network
2012 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2012
This paper presents the performance evaluation of Voice over Internet Protocol (VoIP) in Multi-hop Wireless Network (MWN) developed using Multi-radio Access Relay (MAR). The MWN is deployed using 3 MARs in Universiti Teknikal Malaysia campus. The performance of VoIP are investigated using Real Time Protocol (RTP) and Compress Real Time Protocol (CRTP) header techniques. RTP and CRTP are used to transport voice packets using G711.1, G723.1 and G729.2 codec. The performance of VoIP is analyzed based on three important elements which are delay, jitter and packet loss.