Performance Analysis of Unslotted CSMA Scheme for SUs in Heterogeneous Wireless Network

The spectrum access scheme for secondary users (SUs) in heterogeneous wireless network was studied. We propose a p-selective Carrier Sense Multiple Access (CSMA) scheme of SUs in cognitive radio network under the environment of heterogeneous network, and analyze the system performance by queueing analytic method. Numerical results show that the probability that SUs select different network has a large impact on the performance of SUs in heterogeneous wireless network.