In this chapter, we will review the historic evolution of QoS solutions. With the QoS definition of this book, a QoS solution has two main parts: the network part and the end-point part. Again, we will focus on the network part.
To help people compare and contrast different network QoS solutions, we would like to point out that a network QoS solution is essentially a network resource allocation scheme. Each resource allocation scheme is characterized by the following aspects: