An original measurement system for nonlinear microwave power-transistor characterization using six-port reflectometers is presented. It allows independent active tuning of the output impedances at f 0 and 2f 0 (multiharmonic load-pull) and variation of the source impedance at the input port at f 0 (source-pull). An appropriate search algorithm enables automatic optimization of the output impedances and leads to fast user-friendly operation of the system. Experimental results are shown for a commercial GaAs MESFET power transistor at f 0 = 2 GHz.

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Core network micro-mobility solutions resolve L3 handovers and may be based on the Internet Protocol (IP) or on Multi-Protocol Label Switching (MPLS). When a micro-mobility solution triggers the L3 handover before the L2 handover, it is called predictive, otherwise reactive. The outage period due to the handover is smaller for predictive solutions. However, in order to be predictive, a L3 mobility solution needs support from the underlying link-layer. This support may be provided with the help of IEEE 802.21 that is exploited for intra-technology handovers in WLANs in this paper.