Performance and Phase I Upgrade Plans for the CMS Pixel Detector

The silicon pixel detector is the innermost component of the CMS tracking system. Based on the precise measurement of up to three unambiguous space points, it allows an effective pattern recognition even in the multiple track environment near the interaction point. To sustain the efficiency of the pixel tracker at the increased requirements imposed by high luminosities and pile-up, an improved read-out chip is needed. In this contribution, the performance of the current pixel detector will be presented. Furthermore, an outlook will be given on the plans for a first upgrade of the pixel tracker for the running period until the long LHC shutdown in 2022, referred to as Phase I.