Research On Network Admission Control In SUPANET

The background of the work presented in this dissertation is the SUPANET (Single physical layer User-data transfer & switching Platform Architecture Network) and its core technique, EPFTS (Ethernet-oriented Physical Frame Timeslot Switching) introduced at SC-Netcom Lab. SUPANET adopts out-band signaling concept to enable the "User-data transfer & switching platform" (U-platform) to be reduced to a single layer with higher efficiency and better QoS, (Quality of Service) while the platform for control and management remains as a multi-layer platform (S&M- platform - Signaling and Management platform). The topic of this dissertation is network admission control in SUPANET.Network Admission Control (NAC) involves whether a call request should be accepted or whether user-data should be allowed to enter at the edge of a network. The purpose of Network admission control can be different depending on whether it is a public data network or a customer premises network. In the former case, it is intended to ease network congestion and to ensure the quality of service in delivering user-data;while in the latter case, extended functions, such as network resources protection and authentication, can also be performed. This thesis is dedicated to NAC of sub-networks. SUPANET provides a Virtual Line Switching service at the physical layer for user data;therefore, its NAC includes Call Admission Control (CAC) over its S&M-platform and User-data Admission Control (UAC) over its U-platform based on negotiated QoS and network congestion conditions. The emphasis of this dissertation has been given to UAC.This dissertation explores a UAC policy of throughput based on Output lambda Congestion Status Word (OCSW) and QoS negotiation results, more precisely, the Committed Information Rate (CIR), Committed Burst Rate (CBR), and Extended Burst Rate (EBR). Preliminary experiments with an UAC implementation have shown that the UAC policy is workable and has achieved the preset goal.