Performance analysis of VoIP in Multi-hop Wireless Network

Buletin Pos dan Telekomunikasi, 2020

VoIP is a digital communication technology that is currently developing because VoIP can be implemented on several network topologies, such as bus, star, and ring. Each of these topologies has advantages and disadvantages. So, a study is required to find out in which topology can VoIP be implemented optimally. In this research, VoIP is implemented in several topologies and furthermore the performance measurements are carried out for each topology. VQ manager is installed in order to measure the VoIP performance. For the server, we used Elastix and for the node implementation network topologies, we use several access points. From the results of the research, the performance of VoIP implemented in the star topology produces QoS that is better than other topologies with a delay value of 185 ms, 18 ms jitter, and 1% packet loss. This happens because in the star topology, all packets are distributed centrally. It is expected that the results of this research can be used as a reference in the application of VoIP technology in several types of topologies.

airccse.org

Voice over IP is expected to be very promising application in the next generation communication networks. The objective of this paper is to analyse the VoIP performance among the most competing next generation wireless networks like WiMAX, WLAN and its integrated frameworks etc. WiMAX having higher bandwidth provides higher capacity but with degraded quality of service while WLAN provides low capacity and coverage. Hence, an integrated network using WiMAX backbone and WLAN hotspots has been developed and VoIP application has been setup. As OPNET 14.5.A provides a real life simulation environment, we have opted OPNET as the simulation platform for all performance studies in this work. Quality of the service is critically analysed with parameters like jitter, MOS and delay for various voice codecs in the aforesaid networks for both fixed and mobile scenario. Finally, it is observed and concluded that the WiMAX-WLAN integrated network provides improved and optimal performance over WLAN and WiMAX network with respect to network capacity and quality of service. Exhaustive simulation results have been provided.

International Journal of Advanced Research in Computer Science and Software Engineering

Voice over Internet Protocol (VoIP) is a significant application of the converged network principle where the voice traffic is routed over Internet Protocol shared traffic networks. VoIP traffic was modelled over wireless network and a simulation of the traffic was transmitted over the network. E-model technique was used to analyze the traffic data and also to rate VoIP QoS parameters. The result achieved was mapped to the Mean Opinion Scale to determine the Quality of Service of VoIP over wireless networks. The results shows that QoS in the VoIP communications is significantly impacted by these parameters and the impact varies according to the parameters and also the communication aspects selected for the VoIP traffic analysis.Keywords: VoIP, QoS, E-Model and Mean Opinion Scale

Voice will remain a fundamental communication media that cuts across people of all walks of life. VoIP, a new technology has been increasingly popular in recent times due to its affordability and reduced cost in making calls over broadband Internet. This paper uses simulation method to specifically investigate the performance of VoIP over wireless LAN for an increased number of VoIP calls, the use of different coding scheme and increased number of workstations in video conferencing. With this, a determination of the actual number of VoIP calls that each wireless Access point can adequately support with enhanced voice quality was made alongside with the coding scheme that yields the best quality of service in wireless LAN. KEYWORDS: Voice Over Internet Protocol (VOIP), Public switched telephone Network (PSTN), Jitter, Internet,

International Journal of Mobile Network Communications & Telematics, 2013

Today, Voice over Wireless Local Area Network (VOWLAN) is the most accepted Internet application. There are a large number of literatures regarding the performance of various WLAN networks. Most of them focus on simulations and modeling, but there are also some experiments with real networks. This paper explains the comparison of performance of two different VOIP (Voice over Internet Protocol) applications over the same IEEE 802.11a wireless network. Radio link standard 802.11a have maximum transmission rate of 54Mbps. First protocol is session initiation protocol (SIP) and second is H.323 protocol. First one has an agent called SIP proxy. Second have a gateway reflects the characteristics of a Switched Circuit Network (SCN). With this comparison we have required to obtain a better understanding of wireless network suitability for voice communication in IP network.

In this Paper, the objective of simulation models is presented to investigate the performance of VoIP codecs over WiMAX and FDDI networks that specially design for Aden University. To assure if the University IP network is prepared and adequate for this new type of traffic before adding any new components, Aden University IP network will be simulated by using OPNET simulation software then the new VoIP service will be added to the University networks. Different parameters that represent the QoS like end to end delay, jitter, traffic sends and traffic received, MOS are calculated and analyzed in both network scenarios.

Voice over Internet Protocol is a technology that enables to transport voice over Internet Protocol. The growth of this technology is due to the integration of voice and data traffic over wireless infrastructure. The low cost of voice usage on internet and wide spread of wireless technology has an advantage to implement VoIP system in today IP network. This study investigates the performance of VoIP over different IEEE 802.11standard. The focus of the study will be on IEEE 802.11 b/g/n standard. Data related to the performance parameter of the wireless network and the voice quality will be collected. The qualities of voice are analyzed and summarize into a graph between different Wireless LAN physical layer in deployment of WLAN in the future.

2007

It is a real challenge to implement a good quality of service (QoS) for Voice over Wireless Local Area Networks (WLAN) mainly due to bandwidth limitation. IEEE has addressed this issue and started developing a new standard; 802.11e which concentrates on solving the quality of service problems in a wireless local area networks. The present work presents the modeling and simulation for this standard to improve its QoS when different wireless stations are allowed to roam. In addition to this, Request to Send/Clear to Send (RTS/CTS) frames are added as means to overcome the hidden node problem that could occur in wireless local area networks. The obtained results by simulation are presented and discussed including the ones for Quality of Services differentiation.

2010

Voice over IP (VoIP) supports us to make free of charge or very cheap soft-phone and hard-phone calls locally and globally. VoIP is moving on Wireless Local Area Networks (WLANs) based on IEEE 802.11 standards. For audio speech quality in packet switch applications, the main concerns are end to end delay and packet loss. This paper presents a VoIP-Telephony deployment model using Opnet Simulator. We have configured an experimental setup and analyzed various methods to improve voice quality. Experimental results using IEEE 802.11a/b were analyzed for voice traffic. Experimental results with varying packet loss using Jperf and distributed coordination function (DCF-Voice) presented.

IEEE Transactions on Computers, 2003

Intelligent mobile terminals (or users) of next generation wireless networks are expected to initiate voice over IP (VoIP) calls using session set-up protocols like H.323 or SIP (session initiation protocol). To guarantee the service quality of such applications, the call set-up protocol should be robust against network impairments. In this paper, we analyze the performance of the H.323 call set-up procedure over wireless links using a simple call model under two modes of operations, namely, Regular and Fast Connect. The proposed model assumes the presence of a radio link protocol (RLP) and recommends that the VoIP packets be transferred without any RLP retransmissions, while H.323 control packets be transferred with RLP retransmissions. Our analytical models and detailed experiments show that the VoIP call set-up performance can undergo significant degradation if RLP is not used at all, even for moderately high frame error rates (FERs) in wireless links. On the other hand, a robust radio link layer, such as RLP, can improve the call-set-up delay performance as compared to the existing wireless voice call-set-up delay.