An analysis of quality of service over the automated digital network system

Abstract

With the implementation of the Automated Digital Network System (ADNS), the United States Navy has significantly expanded its communication capabilities. However, as ADNS is installed throughout the Fleet, and bandwidth hungry applications such as video teleconferencing become more popular, network congestion will become a larger and larger problem. Specifically, network congestion will cause a slow down in delivery of all traffic. Applications with hard, real time requirements for data delivery, which treat late message packets as lost packets, will begin to lose data. This thesis will explore the message priority setting and congestion handling functions of ADNS, pointing out inadequacies during congested conditions which may lead to data losses. It will then go on to introduce Quality of Service (QoS) standards being developed by the Internet Engineering Task Force (IETF). These QoS standards are implemented by reservation protocols to provide deterministic service over networks regardless of network loading. Finally this thesis will introduce the Resource Reservation Protocol (RSVP) as a means to implement QoS over ADNS, allowing privileged applications to enjoy deterministic service over the network at any time or under any conditions of network loading