SUPANET Traffic Management Research Based On EPF Singaling Channel

With the wide use of Internet applications especially drastic increase of multimedia traffic, Internet has been facing with four major challenges, i.e. high-speed switching, Quality of Service (QoS), security, and mobility. After unsuccessful attempts through enhancement over existing networks, people have realized the crux of NGI (Next Generation Internet) problem lies in the network architecture. The general background of this thesis is the research on an NGI architecture called Single physical layer User-data switching Platform Architecture (SUPA) which supportd by a key technology-Ethernet-oriented Physical Frame Timeslot Switching (EPFTS) proposed by Sichuan Network Communication Technology Key Laboratory (SC-Netcom Lab).The primary goal of SUPA is to establish a QoS provisioning architecture both in Signaling & Management Platform(S&M-platform) and in User-data switching Platform(U-platform): QoS provisioning system in SUPA involves QoS Negotiation Protocol (QoSNP), Traffic Monitoring and Exchange Protocol (TMEP) and Call Admission Control (CAC) in S&M-platform and QoS-based User-data Admission Control (UAC), Media Quota assignment Algorithm (MQA), scheduling, switching structures mechanisms and queue management in U-platform.During the evolution from Internet to SUPANET, the SUPANET signaling is transmitted by traditional IP protocol stack in S&M-platform while the user-data by EPFS (Ethernet-oriented Physical Frame Sublayer) in U-platform. .However, during the phase of all-EPFTS-based SUPANET, the signaling of SUPANET will also be transmitted by EPFS in order to improve the interactive efficiency of information between U-platform and S&M-platform. So, it is necessary to study Traffic Management in U-platform based on EPF(Ethernet-oriented Physical Frame) Signaling Channel in SUPANET.The main objective of this thesis is the Traffic Management based on EPF Singaling Channel in SUPANET, which mainly includes traffic monitor mechanism, judgment strategy in congestion condition and its origin, discard mechanism in queue management and transmision mechanism in traffic information. This thesis has been gotten the following outcomes: a proposal of a new framework for Multi-Level traffic monitoring mechanisms; a detailed description of congestion detecting criteria and the judging strategy of the main origins of congestions using a new input-port-and-output-port combined method; an investigation of the packet discarding strategies of AQM (Active Queue Management) with respect to the Input Queueing switches; and the protocol design in the workflow of TMEPv2.Based on the theoretical analysis of traffic monitoring and congestion detection in SUPA switching node and the design of TMEPv2 protocol, this thesis builds a SUPA switching model, which is based on the Input-Queued switch, by using OPNET Modeler. Then simulates traffic monitoring, congestion detection and packet discarding mechanisms based on this model, and gives a deep investigation of the key parameters such as the threshold of queue length, the saturation time etc. which heavily affect the network performance. On the other hand, when the severe congestion occurs, the switch node sends explicit congestion notifications via the previously designed TMEPv2 protocol, which proves the effectiveness of the proposed TMEPv2 protocol. To this end, the simulation results showed that the traffic monitoring and U-platform control mechanisms are feasible and effective.