Abstract: One of the main requirements of cognitive radio systems is the ability to detect the presence of the primary user with precise accuracy. Previous works on the issue of detection for cognitive radio show that cooperating secondary users in the network can improve spectrum detection performance in practical situations. However, for the cooperative spectrum sensing, a dedicated control channel bandwidth, which transmits the local detection decisions of Secondary Users (SUs) to the data fusion, becomes larger with the number of secondary users increases. To improve further the performance of cooperative spectrum sensing under dedicated control channel bandwidth-limited constraints, a cooperative spectrum sensing is proposed based on reliable secondary user information. More specifically, only the SUs with reliable information are allowed to send their local decisions to the date fusion otherwise the other will send nothing. Furthermore, the performance of the suggested scheme is derived and the numerical results are given. The analysis results indicate that under bandwidth-limited constraints, the sensing performance of suggested scheme outperform the conventional OR cooperative spectrum sensing.