Avaliação do desempenho da tecnologia VoIP em um conjunto de serviços estendido de acordo com o IEEE 802.11g
DOI:
https://doi.org/10.18046/syt.v15i42.2541Palavras-chave:
Alix, ESS, IEEE 802.11g, MOS, QoE, QoS, VoIPResumo
O desempenho é avaliado experimentalmente com base nas métricas associadas à Qualidade de Serviço [QoS] e à Qualidade de Experiência do Usuário [QoE] no serviço de voz sobre IP [VoIP] para os codecs G.711 e G.729, em um conjunto de serviço estendido com tecnologia Wi-Fi, de acordo com o padrão IEEE 802.11g, implementado através de sistemas embarcados. As métricas de QoS são obtidas através da técnica intrusiva de injeção de tráfego, além disso, a QoE é avaliada por meio da análise MOSc (Mean Opinion Score conversational). Os melhores resultados foram obtidos pelo codec G.729, que atingiu até 25 fluxos simultâneos com valores ótimos de atraso, jitter e perda de pacotes de acordo com a recomendação ITU-T para VoIP. No entanto, o G.711 apresentou melhor throughput. Por outro lado, a avaliação da QoE indica uma ligeira superioridade do G.729 na avaliação MOSc. Finalmente, conclui-se que a perda de pacotes e o atraso são as métricas mais influentes na degradação do serviço VoIP.
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Ahson, S. & Ilyas, M. (2009). VoIP Handbook: Applications, technologies, reliability, and security. Boca Ratón, FL: CRC.
Evans, A. & Britain, K. (1989). Antennas: Selection and installation. Boston, MA: Radio Shack.
Avallone, S., Guadagno, S., Emma, D., & Ventre, G. (Sept. 2004). D-ITG distributed Internet traffic generator. In: Proceedings of the First International Conference on the Quantitative Evaluation of Systems QEST 2004 (pp. 316-317). IEEE.
Cano, M.D. & Cerdan, F. (2012). Subjective QoE analysis of VoIP applications in a wireless campus environment. Telecommunication Systems, 49(1), 5-15.
Canonical Ltd. (2016). Ubuntu 15.04. Retrieved from: http://releases.ubuntu.com/15.04/
Coleman, D. D., & Westcott, D. A. (2009). CWNA: Certified wireless network administrator official study guide. Sybex. Indianapolis, IN: Wiley
Dialogic Corporation. (2007). Overcoming barriers to high-quality voice over IP Deployments [white paper] Retrieved from: http://www.sumopartner.com/Resources/images/17480.pdf
Dini, P., Font-Bach, O., & Mangues-Bafalluy, J. (2008). Experimental analysis of VoIP calls quality support in IEEE 802.11 DCF. In Proceedings of the 6th International Symposium on Communication Systems, Networks and Digital Signal Processing (pp. 443-447). IEEE.
Farproc. (2017). Wifi analyzer [Android App]. Retrieved from: http://www.wifianalyzer.info/
Frost & Sullivan (2017, January 3). Growth opportunities in the VoIP access and SIP trunking services market [white paper]. Retrieved from: https://www.frost.com/c/10107/sublib/display-report.do?id=K0FC-01-00-00-00
Geier, J. (2010). Designing and deploying 802.11n wireless networks. Indianapolis, IN: Cisco.
Hattingh, C., & Szigeti, T. (2004). End-to-end QoS network design: Quality of service in LANs. WANs and VPNs. Indianapolis, IN: Cisco
IBM Knowledge Center. (2011). SPSS data collection 6.0.1: Call duration. Retrieved from: https://www.ibm.com/support/knowledgecenter/en/SSLVQG_6.0.1/com.spss.ddl/mrint_autodialer_callanalysis_callduration.htm
ITU-T Rec. G.114: One-way transmission time. (2003). Geneva, Switzerland: ITU.
ITU-T Rec. P.800: Methods for subjective determination of transmission quality. (1996), Geneva, Switzerland: ITU.
ITU-T Rec. P.830: Subjective performance assessment of telephone-band and wideband digital codecs. (1996). Geneva, Switzerland: ITU.
ITU-T Rec. P.910: Subjective video quality assessment methods for multimedia applications. (2008). International Geneva, Switzerland: ITU.
Keegan, B. & Davis, M. (2006). An experimental analysis of the call capacity of IEEE 802.11b wireless local area networks for VoIP telephony. In Irish Signals and Systems Conference (pp. 283-287). IET.
Kolahi S.S., Shah M.A., & Joseph J. (2012). Performance of VoIP on IPv4 and IPv6to4 tunnel using Windows Vista and Windows 7. In: F. Gaol (Ed.), Lecture Notes in Electrical Engineering, 157: Recent progress in data engineering and internet technology (pp. 477-483). Berlin-Heidelberg, Germany: Springer.
Lara, R., Fernández, C., & Morales, C. (2016). Análisis del desempeño en un enlace descendente de redes basadas en los estándares IEEE 802.11 b, IEEE 802.11n y WDS. RECI, Revista Iberoamericana de las Ciencias Computacionales e Informática, 5(10). Retrieved from: http://reci.org.mx/index.php/reci/article/view/42
Mills, D. L. (1991). Internet time synchronization: The network time protocol. IEEE Transactions on Communications, 39(10), 1482-1493.
Oliveira, C. & Siqueira, M. (2006). Simultaneous VoIP calls capacity over an 802.11 Ad Hoc Network. In: International Conference on Wireless
Networks (pp. 470–476). Berlin, Heidelberg: Germany: Springer-ICST.
PC Engines (2013). ALIX 3d3 Product File. Retrieved from: http://www.pcengines.ch/alix3d3.htm
QPCOM. (2011). QP-2424G high-performance reflector grid Wi-Fi antenna. (2011). Retrieved from: http://qpcom.com.co/Portals/116/QPAO24G24_Spec.pdf
Ramírez, R. (2013). Implantación de un sistema VoIP basado en software libre con Asterisk [Master Thesis]. Universitat Oberta de Catalunya: Barcelona, España.
Ubiquiti Networks (2013). Ubiquiti super range 2. Retrieved from: https://dl.ubnt.com/sr2_datasheet.pdf
Vesga-Ferreira J.C., Granados G., & Vesga-Barrera J.A. (2016). Evaluation of the performance of a network LAN over powerline communications for the transmission of VoIP. Iteckne, 13(1), 83-95.
Villacis, D., Acosta, F., & Lara, R. (2013). Performance analysis of VoIP services over WiFi-based systems. In: IEEE Colombian Conference on Communications and Computing (COLCOM), 2013. Retrieved from: http://ieeexplore.ieee.org/abstract/document/6564813/
Voyage Design and Consultants (2013). About Voyage Linux. Retrieved from: http://linux.voyage.hk
Winstron Neweb Corp. (2011). Winstron CM9-GP. Retrieved from: http://www.roc-noc.com/pdf/wnc/CM9_Data_Sheet.pdf
Zoiper. (2017). Softphone Zoiper 3. Retrieved from: https://www.zoiper.com/
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2017-10-19
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Esta publicação está licenciada sob os termos da licença CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/deed.pt_BR).
