Cooperative Spectrum Sensing (CSS) was proposed as one solution to overcome uncertainty noises in primary signal detection. It increases capability of primary signal detection and accuracy. This paper investigates the performance of decentralized CSS model with limited sensing capability in Cognitive Radio (CR) system. Simulation considers multiple Secondary Users (SUs) sense license channel and distributes their sensing result among others. Partially Observable Markov Decision Process (POMDP) framework is used as an aid for SU that partially sense over license channel.