Coexistence of Secondary User Networks under Primary User Constraints in TV White Space

摘要

Following the current regulation directions and trends in the US and Europe, we set a simulation scenario by considering the propagation model in TV white space, interference to primary users as well as the coexistence among secondary users (PUs). We also describe the management procedure of coexisting secondary user (SU) networks under the interference constraints to the PU receivers. On the basis of a system model we obtain the optimal SU networks time slot allocation ratios by maximizing the aforementioned QoC, therefore, leading to an efficient spectrum usage by SUs without incurring harmful interference to the PUs. Finally, we simulate a coexistence scenario in TV white space in order to compare the proposed scheme with other schemes that select a single SU network to operate based on simplistic criteria. It can be seen that when the SU network employs adaptive transmit power control (TPC), the medium value of QoC is doubled by using the optimal time slot allocation, resulting in significant improvement in coexistence.