A comparative study on centralized and distributed power control in cognitive femtocell network

Abstract

The need for an efficient transmit power is affected by the condition of user and power control methods used. User conditions that categorized in cognitive femtocell networks included in the category as distributed user, so it required a distributed power control (DPC). However, centralized power control (CPC) is also important, especially in the framework as a reference for the independent power control in a distributed user. Therefore, it is important to do a comparison of both methods related to power control the transmit power and the achievement of the target SINR. Comparison of the two schemes was conducted during the feasibility and convergence requirements are met. The results show that CPC can achieve SINR whose value exceeds the SINR targets, while DPC maximum achieving SINR is only up to SINR target. But the power consumed by the CPC is very large when compared to the power consumption at the DPC. So it can be concluded that the method of DPC can save the power better than the CPC.