Advances in Internet Quality of Service

We describe recent advances in theories and architecture that support performance guarantees needed for quality of service networks. We start with deterministic computations and give applications to integrated services, differentiated services, and playback delays. We review the methods used for obtaining a scalable integrated services support, based on the concept of a stateless core. New probabilistic results that can be used for a statistical dimensioning of differentiated services are explained; some are based on classical queuing theory, while others capitalize on the deterministic results. Then we discuss performance guarantees in a best effort context; we review: methods to provide some quality of service in a pure best effort environment; methods to provide some quality of service differentiation without access control, and methods that allow an application to control the performance it receives, in the absence of network support

Theories and Models for Internet Quality of Service

We survey recent advances in theories and models for Internet Quality of Service (QoS). We start with the theory of network calculus, which lays the foundation for support of deterministic performance guarantees in networks, and illustrate its applications to integrated services, differentiated services, and streaming media playback delays. We also present mechanisms and architecture for scalable support of guaranteed services in the Internet, based on the concept of a stateless core. Methods for scalable control operations are also briefly discussed. We then turn our attention to statistical performance guarantees, and describe several new probabilistic results that can be used for a statistical dimensioning of differentiated services. Lastly, we review recent proposals and results in supporting performance guarantees in a best effort context. These include models for elastic throughput guarantees based on TCP performance modeling, techniques for some quality of service differentiation without access control, and methods that allow an application to control the performance it receives, in the absence of network support

Internet QoS for DiffServ-Enabled Routers

Differentiated Service Model (DiffServ) is currently a popular research topic as a low-cost method to bring QoS to today's Internet backbone network. In this paper, the author introduces the techniques and methodologies that used to design and implement DiffServ-enabled (DS-enabled) routers. The adaptations of DS-enabled routers are designed to cater to the low Internet connectivity within Universiti Teknologi PETRONAS LAN. The author has implemented basic DiffServ setting using three CISC03725 routers. Based on these DiffServ-enabled routers, the author set up a small scale lab network to study DiffServ QoS features: priority dropping (discrimination among different service classes), QoS guarantees and measuring QoS using various formal metrics (delay and throughput). Furthermore, the author present problems encountered during study, and the proposed solutions

Performance of the transmission control protocol (TCP) over wireless with quality of service.

Thesis (M.Sc.Eng.)-University of Natal, Durban, 2001.The Transmission Control Protocol (TCP) is the most widely used transport protocol in the Internet. TCP is a reliable transport protocol that is tuned to perform well in wired networks where packet losses are mainly due to congestion. Wireless channels are characterized by losses due to transmission errors and handoffs. TCP interprets these losses as congestion and invokes congestion control mechanisms resulting in degradation of performance. TCP is usually layered over the Internet protocol (lP) at the network layer. JP is not reliable and does not provide for any Quality of Service (QoS). The Internet Engineering Task Force (IETF) has provided two techniques for providing QoS in the Internet. These include Integrated Services (lntServ) and Differentiated Services (DiffServ). IntServ provides flow based quality of service and thus it is not scalable on connections with large flows. DiffServ has grown in popularity since it is scalable. A packet in a DiffServ domain is classified into a class of service according to its contract profile and treated differently by its class. To provide end-to-end QoS there is a strong interaction between the transport protocol and the network protocol. In this dissertation we consider the performance of the TCP over a wireless channel. We study whether the current TCP protocols can deliver the desired quality of service faced with the challenges they have on wireless channel. The dissertation discusses the methods of providing for QoS in the Internet. We derive an analytical model for TCP protocol. It is extended to cater for the wireless channel and then further differentiated services. The model is shown to be accurate when compared to simulation. We then conclude by deducing to what degree you can provide the desired QoS with TCP on a wireless channel

The economic effects of network neutrality: a policy perspective

Network neutrality - regulation of Internet service providers (ISPs) to ensure equal treatment of all traffic - is becoming something many people have heard about. While the context is technical, network neutrality ultimately boils down to economics. The political weight of the subject is heavy, and the international debate is fierce. Still, surprisingly little rigorous research appears to be behind it. In this paper, I review economic literature on network neutrality and ISP regulation, covering both practical and theoretical implications for the broadband market. I define the degrees of network neutrality with more granularity than papers so far, evaluate the qualitative economic effects of regulation, and describe the broadband market, frameworks for modeling it, and its peculiar economic characteristics. In particular, I review and compare different theoretical modeling approaches and models' predictions of the welfare effects of different regulatory regimes. Throughout the paper, I incorporate economic literature from relevant areas into the analysis. I do not make definite policy recommendations, but I draw conclusions that are potentially of interest from a policy point of view. My analysis would indicate that the complexity of the Internet ecosystem and interrelations between market participants make effective regulation difficult. There is no economic evidence that network neutrality generally increases total welfare. In fact, it turns out that from a well-rounded economic perspective, strong network neutrality appears in most cases as detrimental to both consumer surplus and total welfare. In certain scenarios, however, models predict that neutrality can increase static and dynamic efficiency. The results depend crucially on model specifications and parameters, which differ significantly across the literature. So far, there is no consensus among economists on the optimal level of ISP regulation. Market-driven solutions such as dynamic pricing might provide a way to circumvent the neutrality question. Verkkoneutraliteetti - teleoperaattorien sääntely tietoliikenteen tasa-arvoisen kohtelun varmistamiseksi - on astunut käsitteenä julkisuuteen. Vaikka konteksti onkin tekninen, verkkoneutraliteetti viime kädessä redusoituu taloustieteeseen. Aiheen poliittinen painoarvo on suuri ja kansainvälinen keskustelu kiivasta. Tästä huolimatta sen takaa vaikuttaa löytyvän yllättävän vähän tieteellistä tutkimusta. Lopputyössäni tarkastelen taloustieteellistä kirjallisuutta verkkoneutraliteetista ja teleoperaattorien sääntelystä ja sen vaikutuksia laajakaistamarkkinaan käytännöllisestä kuin myös teoreettisesta näkökulmasta. Määrittelen verkkoneutraliteetin asteet hienojakoisemmin kuin aikaisemmat julkaisut, arvioin sääntelyn laadullisia vaikutuksia ja kuvailen laajakaistamarkkinaa, viitekehyksiä sen mallintamiseksi sekä sen eriskummallisia taloudellisia piirteitä. Kuvaan teoreettisia lähestymistapoja ja merkittävimpien mallien ennusteita sääntelymallien hyvinvointivaikutuksista. Liitän analyysini relevanttiin taloustieteelliseen kirjallisuuteen. En anna suoria politiikkasuosituksia, mutta teen johtopäätöksiä, jotka ovat mahdollisesti mielenkiintoisia poliittisesta näkökulmasta. Analyysini perusteella vaikuttaa, että Internet-ekosysteemin monimutkaisuus ja toimijoiden väliset suhteet tekevät tehokkaasta sääntelystä vaikeaa. Taloustieteellistä näyttöä verkkoneutraliteetin hyvinvointia kasvattavista vaikutuksista ei ole. Tasapainoisesta taloudellisesta näkökulmasta katsottuna tiukka neutraliteettisääntely näyttää useimmissa tapauksissa sekä pienentävän kuluttajan ylijäämää että laskevan kokonaishyvinvointia. Joissakin skenaarioissa mallit toisaalta ennustavat neutraliteetin lisäävän staattista ja dynaamista tehokkuutta. Tulokset riippuvat rajusti mallin rakenteesta ja parametreistä, jotka vaihtelevat merkittävästi tutkimuksesta tutkimukseen. Toistaiseksi taloustieteilijät eivät ole päässeet yhteisymmärrykseen optimaalisesta teleoperaattorien sääntelyn asteesta. Markkinalähtöiset ratkaisut kuten dynaaminen hinnoittelu saattavat mahdollistaa neutraliteettikysymyksen kiertämisen

The growing complexity of content delivery networks: Challenges and implications for the Internet ecosystem

Since the commercialization of the Internet, content and related applications, including video streaming, news, advertisements, and social interaction have moved online. It is broadly recognized that the rise of all of these different types of content (static and dynamic, and increasingly multimedia) has been one of the main forces behind the phenomenal growth of the Internet, and its emergence as essential infrastructure for how individuals across the globe gain access to the content sources they want. To accelerate the delivery of diverse content in the Internet and to provide commercial-grade performance for video delivery and the Web, Content Delivery Networks (CDNs) were introduced. This paper describes the current CDN ecosystem and the forces that have driven its evolution. We outline the different CDN architectures and consider their relative strengths and weaknesses. Our analysis highlights the role of location, the growing complexity of the CDN ecosystem, and their relationship to and implications for interconnection markets.EC/H2020/679158/EU/Resolving the Tussle in the Internet: Mapping, Architecture, and Policy Making/ResolutioNe

Multimedia in mobile networks: Streaming techniques, optimization and User Experience

1.UMTS overview and User Experience 2.Streaming Service & Streaming Platform 3.Quality of Service 4.Mpeg-4 5.Test Methodology & testing architecture 6.Conclusion

Internet QoS for DiffServ-Enabled Routers

Differentiated Service Model (DiffServ) is currently a popular research topic as a low-cost method to bring QoS to today's Internet backbone network. In this paper, the author introduces the techniques and methodologies that used to design and implement DiffServ-enabled (DS-enabled) routers. The adaptations of DS-enabled routers are designed to cater to the low Internet connectivity within Universiti Teknologi PETRONAS LAN. The author has implemented basic DiffServ setting using three CISC03725 routers. Based on these DiffServ-enabled routers, the author set up a small scale lab network to study DiffServ QoS features: priority dropping (discrimination among different service classes), QoS guarantees and measuring QoS using various formal metrics (delay and throughput). Furthermore, the author present problems encountered during study, and the proposed solutions

Internet QoS for DiffServ-Enabled Routers

Differentiated Service Model (DiffServ) is currently a popular research topic as a low-cost method to bring QoS to today's Internet backbone network. In this paper, the author introduces the techniques and methodologies that used to design and implement DiffServ-enabled (DS-enabled) routers. The adaptations of DS-enabled routers are designed to cater to the low Internet connectivity within Universiti Teknologi PETRONAS LAN. The author has implemented basic DiffServ setting using three CISC03725 routers. Based on these DiffServ-enabled routers, the author set up a small scale lab network to study DiffServ QoS features: priority dropping (discrimination among different service classes), QoS guarantees and measuring QoS using various formal metrics (delay and throughput). Furthermore, the author present problems encountered during study, and the proposed solutions