Search

Based on the need for secure and reliable mobile communication, this paper investigates the application-perceived throughput of an end-to-end (E2E) VPN connection using IPSec over GPRS. GPRS is of particular interest regarding performance issues due to its wide deployment but limited capacity. To this end, different encryption and authentication algorithms are considered. The throughput is measured on small time scales and interpreted with aid of summary statistics, histograms and autocorrelation coefficients. The results reveal a clear influence of the network and the chosen security solution, seen from variations of application-perceived throughput on the one-second time scale, which has to be considered when assessing the appropriateness of network for a specific task. The different statistical metrics considered will later be used in our research to maintain the security and Quality of service (QoS) of the service decided by the user.

Based on the need for distributed end-to-end quality management for next-generation mobile Internet services, this paper presents a ready-to-deploy quality assessment concept for the impact of the network on the performance of mobile services. We consider the throughput utility function (TUF) as a special case of the network utility function (NUF). These functions combine the observed network utility at the inlet and the outlet of a mobile network. NUF and TUF capture the damping effect of the network onto user-perceived quality from an end-to-end perspective. As opposed to sometimes hard-to-evaluate QoS parameters such as delay and loss, the NUF is highly intuitive due to its mapping to a simple value between 0 and 100 %, which reflects user perception. We demonstrate the capabilities of the proposed TUF by measurements of application-perceived throughput conducted in a mobile, i.e. GPRS and UMTS network. Ett nytt sätt att uttrycka nätverkets inflytande på tjänstekvaliten (skala från 0 till 100) för mobila tjänster. Extended abstract. Paper to be submitted for publication in the post-workshop proceedings. Project homepage: www3.informatik.uni-wuerzburg.de/staff/automon EuroNGI homepage: www.eurongi.org