Suchergebnisse

Mobile IP allows a mobile node to roam into a
foreign IP network without losing its connection with its
peer. Mobile IPv6 uses Route Optimization to improve the routing performance by avoiding the triangle routing problem and adopting Return Routability as a secure process for binding update. Host Identity Protocol (HIP) is an experimental security protocol which provides mobility management and multi-homing with new namespace. HIP has a similar architecture to the Mobile IP with Route Optimization. In this paper, we introduce a Secure Mobile IP with HIP Style Handshaking and Readdressing (SMIP), which provides stronger security, better performance and
lower binding cost than Mobile IPv6 does in binding update process. The dependency of the home agent in the new scheme is dramatically decreased. The initiated scheme integrates the primary features of two completely different mobility management solutions and sets up a migration path from mobile-IP based solution to a public-key based solution in mobile IP networks.

The design of compact wideband microwave reflectometers for the purpose of inclusion in a breast cancer detection system is presented. In this system, a wideband frequency source is used to synthesize a narrow pulse via the step-frequency synthesis method. The reflectometer undertakes measurements in the frequency domain and the collected data is transformed into the time/space domain using IFFT. In order to accomplish reflection coefficient measurements over a large frequency band, compact wideband couplers and power dividers are used to form the reflectometer. Two compact six-port reflectometer configurations are investigated. One uses the Lange coupler and the Gysel power divider and the other one employs a 3dB slot-coupled microstrip coupler and a 2-stage Wilkinson power divider. The reflectometer employing the slot-coupled coupler and the Wilkinson divider provides a wider operational bandwidth, as shown by simulation results performed with Agilent ADS.