IMS-based performance analysis of a MANET controlled by the Delay-Aware NUM system

This paper presents the results of the performance evaluation concerning 3G/3GPP IP Multimedia Subsystem (IMS) applications deployed in a wireless multi-hop network controlled by the Delay-Aware Network Utility Maximization System (DANUMS). The main purpose of the DANUM system is simultaneous service of files and multimedia streams, i.e., types of traffic of different delay requirements. DANUMS combines a queue-level-based approximation of Max Weight Scheduling with a multi-path backpressure-oriented extension of the Optimized Link State Routing (OLSR) protocol. In order to evaluate DANUMS in a 3G videoconferencing scenario, we have integrated an Open IMS Core wired network installation with a wireless DANUMS testbed (playing the role of an IMS access network). The results of experiments presented in the paper show that by applying the DANUMS virtual queuing system, we can achieve a utility-aware coexistence of IMS audiovisual streams and non-IMS flows of different delay requirements.