This book focuses on Internet congestion control with special emphasis given to signalling and network architecture. The author introduces a protocol called Performance Transparency Protocol (PTP) and a congestion control mechanism called Congestion Avoidance with Distributed Proportional Control (CADPC), as well as providing: a complete specification of PTP; simulation results that show how CADPC/PTP outperforms several current alternatives; a method of using the well-known Chiu/Jain vector diagrams for analysis and design; a short and easily comprehensible introduction to Congestion Control and Quality of Service; and an overview of explicit signalling mechanisms between end points and the network.