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This paper proposes an inter-beam handover (IBH) scheme in millimeter wave (mmWave) communication systems. Since the width of a beam transmitted by a base station (BS) is very narrow, the IBH can frequently occur within a BS. For this reason, the previous handover scheme based on the radio resource control (RRC) message can cause the increase of the signaling overhead. In addition, the performance...
The signals received at the receiving antenna are consist of signals from base station (or mobile terminal) and transmitted signals from the other side of antenna in a RF repeater. And the amplification rate of the RF repeater is limited by the feedbacked signals from the same repeater. Therefore, a receiving antenna has to be isolated from a transmitting antenna in order to reduce the effect of the...
Multi-level NAND flash memories with a 20nm design rule have been successfully developed for the first time. A 20nm rule wordline (WL) and bitline (BL) direction have been realized by Spacer Patterning Technology (SPT) of ArF immersion lithography. Key integration technologies include WL airgap with separate gate etch process and optimized control gate (CG) poly deposition process. In addition, many...
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