Yıl 2019, Cilt , Sayı 16, Sayfalar 638 - 645 2019-08-31

Ns-2'de Farklı Arka Plan TCP Trafik Koşulları Altında VoIP'nin Kullanıcı Düzeyinde Performans Değerlendirmesi
User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2

Fatih Abut [1]


IP üzerinden ses (Voice over IP; VoIP), giderek daha fazla önem kazanmakta ve geleneksel telefonun yerini almaktadır. Örneğin, dünya genelinde aylık 300 milyondan fazla aktif kullanıcı, popüler VoIP uygulaması Skype’ı kullanmaktadır. Ancak, VoIP ortamında ses kalitesi büyük bir sorun teşkil etmektedir. Bu çalışmanın amacı, arka plan TCP trafiğinin kullanıcı düzeyinde bir VoIP konuşmasının algılanan ses kalitesi üzerindeki etkilerini G.711 kodeğini kullanarak incelemektir. VoIP sunucusu tarafından statik tamponlama ve optimal tamponlamayı içeren iki farklı tamponlama politikası uygulanmıştır. Karşılaştırma amacıyla, VoIP sunucusu tarafından herhangi bir tamponlama politikası uygulanmadığında da aynı deneyler tekrarlanmıştır. Kaynak, transit ve hedef alt ağdan oluşan üç sekmeli bir ağ topolojisi simüle edilirken, tüm ağın uçtan uca kapasitesi 1.5 Mbps Asimetrik Dijital Abone Hattı (ADSL) bağlantısı ile sınırlandırılmıştır. Arka plan trafiğinin değişken koşullarını simüle etmek için farklı segment boyutlarında birden fazla eşzamanlı TCP bağlantısı kurulmuştur. Popüler Network Simulator 2'ye (ns-2) eklenen bir geliştirme olan ns2voip framework’ü kullanılarak VoIP kullanıcı seviyesi performansını analiz etmek için kapsamlı simülasyon deneyleri yapılmıştır ve ses kalitesi Ortalama Görüş Puanı (OGP) hesaplanarak değerlendirilmiştir. Sonuçlar, ses kalitesinin 1500 Bayt segmentli tek bir TCP akışında bile arka plan TCP trafiğinden güçlü bir şekilde olumsuz etkilendiğini göstermektedir. Ayrıca, arka plan TCP trafiğinin boyutu, VoIP konuşmalarının ulaşılabilir OGS'lerini önemli ölçüde etkilemektedir. Bununla birlikte, birden fazla konuşma çerçevelerinin tek bir IP paketi içerisine toplanmasının OGS’yi artırabileceği de gözlenmiştir. Özellikle, arka plan TCP akışlarının sayısına ve segment boyutuna bağlı olarak, en uygun sayıdaki ses çerçevelerinin aynı IP paketinde toplanması, OGS'leri 1.5 Mbps ADSL bağlantısı üzerinden %14.61'e kadar iyileştirdiği görülmüştür.

Voice over IP (VoIP) is gaining more and more importance and displaces the traditional telephony. For example, more than 300 million monthly active users worldwide use the popular VoIP application "Skype". However, a big problem in the VoIP environment is the voice quality. The purpose of this study is to investigate the effects of background TCP traffic on perceived voice quality of a VoIP conversation at the user-level using the G.711 codec. Two different playout buffering policies including static buffering and optimal buffering have been applied by the VoIP server. For comparison purposes, the same experiments have also been repeated when no playout buffering policy has been applied by the VoIP server. A three-hop network topology consisting of a source, a transit, and a destination subnetwork was simulated whereas the end-to-end capacity of the entire network was limited by a 1.5 Mbps Asymmetric Digital Subscriber Line (ADSL) link. Multiple simultaneous TCP connections with different segment sizes were established to simulate the various conditions of background traffic. By using the ns2voip framework, an enhancement to the popular Network Simulator 2 (ns-2), extensive simulation experiments for analyzing the VoIP user-level performance have been carried out and the voice quality has been evaluated by calculating the Mean Opinion Score (MOS). The results show that the voice quality is strongly negatively affected by background TCP traffic, even in the presence of a single TCP flow with 1500 Byte segments. Also, the size of background TCP segments significantly influences the achievable MOSs of VoIP conversations. However, it has also been observed that aggregating multiple speech frames into a single IP packet can increase the MOS. Particularly, depending on the number and segment size of background TCP flows, aggregation of the optimal number of voice frames into the same IP packet improves the MOSs up to 14.61% over a 1.5 Mbps ADSL link.

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Birincil Dil en
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Yazarlar

Orcid: 0000-0001-5876-4116
Yazar: Fatih Abut (Sorumlu Yazar)
Ülke: Turkey


Tarihler

Yayımlanma Tarihi : 31 Ağustos 2019

Bibtex @araştırma makalesi { ejosat585736, journal = {Avrupa Bilim ve Teknoloji Dergisi}, issn = {}, eissn = {2148-2683}, address = {}, publisher = {Osman SAĞDIÇ}, year = {2019}, volume = {}, pages = {638 - 645}, doi = {10.31590/ejosat.585736}, title = {User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2}, key = {cite}, author = {Abut, Fatih} }
APA Abut, F . (2019). User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2. Avrupa Bilim ve Teknoloji Dergisi , (16) , 638-645 . DOI: 10.31590/ejosat.585736
MLA Abut, F . "User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2". Avrupa Bilim ve Teknoloji Dergisi (2019 ): 638-645 <https://dergipark.org.tr/tr/pub/ejosat/issue/45333/585736>
Chicago Abut, F . "User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2". Avrupa Bilim ve Teknoloji Dergisi (2019 ): 638-645
RIS TY - JOUR T1 - User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2 AU - Fatih Abut Y1 - 2019 PY - 2019 N1 - doi: 10.31590/ejosat.585736 DO - 10.31590/ejosat.585736 T2 - Avrupa Bilim ve Teknoloji Dergisi JF - Journal JO - JOR SP - 638 EP - 645 VL - IS - 16 SN - -2148-2683 M3 - doi: 10.31590/ejosat.585736 UR - https://doi.org/10.31590/ejosat.585736 Y2 - 2019 ER -
EndNote %0 Avrupa Bilim ve Teknoloji Dergisi User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2 %A Fatih Abut %T User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2 %D 2019 %J Avrupa Bilim ve Teknoloji Dergisi %P -2148-2683 %V %N 16 %R doi: 10.31590/ejosat.585736 %U 10.31590/ejosat.585736
ISNAD Abut, Fatih . "User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2". Avrupa Bilim ve Teknoloji Dergisi / 16 (Ağustos 2019): 638-645 . https://doi.org/10.31590/ejosat.585736
AMA Abut F . User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2. Avrupa Bilim ve Teknoloji Dergisi. 2019; (16): 638-645.
Vancouver Abut F . User-level Performance Evaluation of VoIP under Different Background TCP Traffic Conditions in ns-2. Avrupa Bilim ve Teknoloji Dergisi. 2019; (16): 645-638.