Abstract
The packet-based data transmission of the Internet allows the multiplexing of a variety of simultaneous connections originating from sources with different characteristics (e.g. voice, video, data). Traditional Internet is based on a best effort service, whereas future Internet services make more and more special demands on the communication network. This paper presents a general overview of fundamental mechanisms for guaranteeing Quality of Service (QoS) in the current and future Internet. After introducing general QoS concepts, basic mechanisms in network routers are investigated. Furthermore, the two basic architectures of Integrated Services (IntServ) and Differentiated Services (DiffServ) are discussed in detail. Finally, the analytical investigation of a special Voice-over-IP scenario demonstrates the applicability of the relevant QoS concepts and their positive consequences with respect to the quality of this voice service. A short overview of current hot research topics concludes the paper.
Zusammenfassung
Die paketbasierte Datenübertragung über das Internet ermöglicht das Multiplexen einer Vielzahl gleichzeitiger Verbindungen aus unterschiedlich charakterisierten Datenquellen (z. B. Sprache, Video, Datentransfer). Während im traditionellen Internet allerdings die Übertragung auf dem Best Effort-Prinzip basiert, stellen die zukünftig angebotenen neuen Internet-Dienste laufend mehr spezielle Anforderungen an das Kommunikationsnetz. Dieser Artikel gibt einen allgemeinen überblick über fundamentale Mechanismen zur Garantie einer gewünschten übertragungsgüte (Quality of Service, QoS) im heutigen und zukünftigen Internet. Nach der Einführung allgemeiner QoS-Konzepte liegt der Fokus zunächst auf den Grundmechanismen innerhalb der Netzrouter. Sodann werden die beiden grundlegenden Arthitekturen der Integrated Services (IntServ) und Differentiated Services (DiffServ) im Detail behandelt. Schließlich demonstriert die genauere Untersuchung eines speziellen Voice-over-IP-Szenarios die Anwendbarkeit der eingeführten Prinzipien und ihre positiven Auswirkungen auf die Qualität des betrachteten Sprachdienstes. Ein kurzer Überblick über aktuell behandelte Forschungsthemen rundet den Artikel ab.
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Plasser, E., Ziegler, T., Reichl, P. et al. Internet services beyond best effort. Elektrotech. Inftech. 119, 30–36 (2002). https://doi.org/10.1007/BF03161578
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DOI: https://doi.org/10.1007/BF03161578
Keywords
- quality of service
- Internet
- TCP/IP
- integrated services
- differentiated services
- voice over IP
- resource reservation
- admission control