Chapter 1. Introduction

Significance of the Research

The Internet has historically offered a single level of service (“best effort,” without any guarantee of quality) via the Internet Protocol (IP). Its best-effort service means service in which all data packets are treated equally. The quality of service (QoS) on IP (hereinafter referred to as IP QoS) [1], [2] has not been a significant issue in the Internet community until recently. The IP datagram (packet) header includes one type-of-service (ToS) byte. ToS values can be used to indicate the different QoS needs of the datagram, and they can be taken into account by routers for choosing among the different types of datagram transport. However, the ToS byte has essentially been ignored by both ...

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