Abstract
We propose a CSMA scheme with guard channels in heterogeneous wireless network. In this system, there are two different networks B and A. Original users of A network (called network A users) can use the wireless resources of network A and B. Original users of B network (called network B users) can only use the wireless resources of network B. There are Ng guard channels in network B, in order to guarantee the service quality of B network users. We model the system by three dimensional continuous time Markov chain and solve the steady state probability. We also obtain the system performance measures such as the total throughput, the loss probability of network A and network B users. Numerical results show that number of guard channels and the arrival rate of different network users give an important impact on the system performance, and the performance of our proposed CSMA scheme with guard channels is better than that of without guard channels.
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